Solve the system of equations by substitution.


2x + y = 3z

x + y = 6z


What is the value for y from the first equation, that could be substituted into the second equation?


A. -2x +3z

B. 3z + 2x

C. -2x - 3z

D. 2x + 3z

Answers

Answer 1
Answer is A. -2x + 3z
Reason
2x + y = 3z
If you subtract 2x from both sides to isolate “y”
2x -2x +y = -2x + 3z
Now combine like terms
You get
y= -2x + 3z
Problem solved

Related Questions

11
Stephen is n years old.
Rachel is 10 years older than Stephen
(a) Write an expression for Rachel's age.
Tim is 13 years younger than Stephen.
(b) Write an expression for Tim's age.
Juil
neb
13
12
inotdan ni
(c) Write an expression for the total age of Stephen, Rachel and Tim.
nt
2

Answers

a) n + 10
b) n - 13
c) n + (n+10) + (n-13)

Police estimate that 20% of drivers do not wear their seatbelts. The police set up a safety roadblock and stopping cars to check for seatbelt use. If the police team stops 30 cars during the first hour, what is the standard deviation?

Answers

If Police estimate that 20% of drivers do not wear their seatbelts. The police set up a safety roadblock and stopping cars to check for seatbelt use. If the police team stops 30 cars during the first hour,  the standard deviation is 2.191.

How to find the standard deviation?

Using this formula to find the Standard deviation

Standard deviation = √ Sample size  × Estimated drivers × (1 - Estimated drivers)

Let plug in the formula

Standard deviation = √ 30 × 0.20 × (1- 0.20)

Standard deviation = √ 30 × 0.20 × 0.80

Standard deviation = √ 4.8

Standard deviation = 2.191

Therefore we can conclude that the standard deviation is 2.191.

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Select each expression that has a difference of 4 3/12 

Answers

Answer:

Step-by-step explanation:

9 7/12 - 5 4/12 = 4 3/12

The diameter of a circle is 18 in. Find its area to the nearest whole number.

Answers

Answer:

The answer is 20

Answer: 254 in^2

Step-by-step explanation:

Write two equations showing the Transitive Property of Equality. Justify your reasoning.

Answers

The Transitive Property of Equality states that if a = b and b = c, then a = c. This property holds true for any mathematical expressions that can be equated, such as numbers, variables, or more complex equations. Here are two examples of equations that demonstrate the Transitive Property of Equality:

x + 5 = 9 and 9 = y - 2
x + 5 = y - 2
a^2 + 2ab + b^2 = (a+b)^2 and (a+b)^2 = a^2 + 2ab + b^2
a^2 + 2ab + b^2 = a^2 + 2ab + b^2
In both examples, by using the transitive property, we can conclude that x = y and (a+b)^2 = (a+b)^2 which both are same expressions.

In the first equation, we start with x + 5 = 9 and then 9 = y - 2. Since both sides of the first equation are equal to 9, we can substitute 9 for x + 5 in the second equation, giving us 9 = y - 2. This shows that the left side of the first equation is equal to the right side of the second equation, which is the Transitive Property of Equality.

In the second equation, we start with a^2 + 2ab + b^2 = (a+b)^2 and then (a+b)^2 = a^2 + 2ab + b^2, since both sides are the same then we can substitute (a+b)^2 for a^2 + 2ab + b^2 in the second equation, which results in (a+b)^2 = (a+b)^2. This shows that the left side of the first equation is equal to the right side of the second equation, which is the Transitive Property of Equality.

In summary, The transitive property states that if you have two expressions are equal to each other, and the second expression is equal to the third, then the first and the third expressions are equal to each other.

Determine the total flops as a function of the number of equations n for the decomposition, forward-substitution, and back-substitution phases of the LU decomposition version of Gauss elimination.

Answers

The total flops as a function of the number of equations n for the LU decomposition version of Gauss elimination is given by (n^3 + 3n^2)/3.

The LU decomposition version of Gauss elimination involves 3 phases which are :

decomposition forward-substitution back-substitution.

The flops in decomposition phase is (n^3)/3, forward-substitution phase is n^2 and back-substitution phase is 2n^2. By adding all the flops for these 3 disinct phases we get (n^3 + 3n^2)/3 as total flops as a function of the number of equations n for the LU decomposition version of Gauss elimination.

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Linda bought a washer and dryer from Mill page Laundry Supplies for y dollars. She signed an installment agreement requiring a 15% down payment and monthly payments of dollars for one year.

Answers

a)  Her down payment algebraically  is 0.15y (b). number of monthly payments must Linda make12 months (c) The total amount of the monthly payments algebraically is  12x (d) The  first term a

and the common ratio d  a1 = 0.15y, d = x  (e)  The total amount Linda pays for the washer and dryer on the installment plan algebraically is 12x + 0.15y (e) the finance charge algebraically (12x + 0.15y) - y = 12x - 0.85y

How to solve the problems?

The given parameters that will help us get the solutions are

If y = cost of washer and dryer

x = cost for one month.

Down payment = 0.15y

Numbers of months = 12months

Amount of monthly payment = 12x

First term and common ratio = a1 = 0.15y and d = x

Total amount for washer and dryer 12x + 0.15y

Finance charge

(12x + 0.15y) - y

12x - 0.85y

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Complete question:

2. Linda bought a washer and dryer from Millpage Laundry Supplies for y dollars. She signed an

installment agreement requiring a 15% down payment and monthly payments of x dollars for one

year.

a. Express her down payment algebraically.

b. How many monthly payments must Linda make?

c. Express the total amount of the monthly payments algebraically.

d. If Linda models her payment plan as an arithmetic sequence, give the first term a

and the common ratio d

e. Express the total amount Linda pays for the washer and dryer on the installment plan

algebraically.

f. Express the finance charge algebraically.

At a certain college, 64% of the entering freshmen graduate. If we randomly selected 10 entering freshman, find the probability that: 14. Exactly 5 of the students will graduate 15. At least 8 of the students will graduate.

Answers

14) Probability that exactly 5 of the students will graduate is 0.1636.

15) Probability that atleast 8 of the students will graduate is 0.2405.

We have , In a college,

The freshmen graduate enters = 64%

Probability of sucess , p = 64% = 0.64

Probability of failure , q = 1 - 0.64 = 0.36

Randomly selected entering = 10 , i.e, n = 10.

This follows a Binomial probability distribution with the parameters, n = 10 and p = 0.64.

Using Binomial probability formula,

P(X = x) = ⁿCₖ pᵏ (1 - p)ⁿ⁻ᵏ

(14) Probability that exactly 5 of the students will graduate = P(x = 5),

P( x = 5) = ¹⁰C ₅ (0.64⁵) (0.36⁵)

= 0.1636

15) Probability that at least 8 of the students will graduate, P(x ≥8) = P(X= 8) + P(X= 9) + P(X= 10)

= ¹⁰C₈ 0.64⁸ 0.36² + ¹⁰C₉ 0.64⁹ 0.36¹ + ¹⁰C₁₀ 0.64¹⁰ 0.36⁰ = 0.2405

Hence, the required probabilities are 0.1636 and 0.2405.

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A student graphed f(x) = x and g(x) = f(x) - 5 on
the same coordinate grid. Which statement
describes how the graphs of f and g are related?

A The graph of f is shifted 5 units up to create the
graph of g.
B The graph of f is steeper than the graph of g.
C The graph of f is shifted 5 units down to create
the graph of g.
D The graph of f is less steep than the graph of g.

Answers

The statement (c) describes that the graph of f is shifted 5 units down to create the graph of g. The solution has been obtained using the concept of vertical translation.

What is translation?

Translation is the act of moving a shape or a figure from one position to another. It is classified into two types:

Horizontal Translation: This describes the movement of a function graph to left or right.Vertical Translation: This describes the movement of a function graph upward or downward.

Now, for a function f(x) we define a vertical translation of N units as:

g(x) = f(x) + N

If N is positive, the translation is upwards.

if N is negative, the translation is downwards.

We are given g(x) = f(x) - 5

This shows that N is negative and therefore, there is translation of 5 units downwards.

Hence, the graph of f is shifted 5 units down to create

the graph of g.

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A computer can do a computation in 6.8 x 10-9 seconds? How many computations can the computer do in 5 minutes

Answers

Answer:

≈[tex]4.4117647059\times10^{10}[/tex] computations in five minutes.

Step-by-step explanation:

[tex]\frac{5*60}{6.8\cdot10^{-9}}[/tex] = [tex]4.4117647059\times10^{10}[/tex].

Proof in the image.

Please mark brainliest so I can get to the expert rank (only 10 to go!)

StarWatch Camping Site
The holiday is just 9 weeks away and they
each plan to save £13 per week from now
Charge per person: £6 per night
until their holiday.
Will they save enough money to cover all
Tent pitch:
≤ 10 mª at £15 per night
their camping site charges?
(ground surface)
If the answer is 'yes' say how much extra
>
10 mª at £18 per night
money they will save.
You must show all your working.
Special offer:
For
every 5 nights you
stay, only pay for 4.
Lila and Wassim are planning a stay
at the StarWatch camping site.
They will:
share a tent between them,
both stay for a total of 10 nights,
use a tent with a rectangular base
measuring 2.3 by 4.2 metres.

Answers

Answer:

The total cost of their stay at the StarWatch camping site will be £108. This includes the special offer of 5 nights for the price of 4.

Lila and Wassim have saved £130 by the time of their holiday. This means they have saved £22 extra.

2. Find the value of x in the triangle. Round your answer to the nearest tenth of a degree. Show your work.

Answers

In the above case which involves a Pythagorean Triangle, using the trigonometric function TOA to solve we get: 61.93°


What is the Trigonometric function TOA?

TOA is the acronnum for:

Tangent (θ) = Opposite /Adjacent

Tangent (θ) = 8/15

θ = Tan⁻¹ 0.5333333333

Thus

θ =  61.93°

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how many groups of 1/4 are in 7

Answers

Answer:

28

Step-by-step explanation:

28 groups of 1/4 goes into 7

Answer:

28

Step-by-step explanation:

This is a division problem.

7 ÷ 1/4 =

= 7/1 ÷ 1/4

= 7/1 × 4/1

= 28/1

= 28

Answer: 28

You can also solve it this way.

There are 4 1/4's in 1.

In 7, there must be 7 times as many 1/4's.

7 × 4 = 28

Answer: 28

Situation: Rocco jogs and then walks at the park. Today, he has already jogged 4 miles.
He then starts counting the miles he walks at a constant rate of 3 miles every
2 hours. What is the total distance Rocco travels at the park?
1) Equation:
Where x is:
Where y is:
2) Fill in all empty cells
in the table of values.
3) Proportional or
nonproportional:

Answers

Part 1: Where x is: time in hours. Where y is: distance in miles.

Part 2: The table is filled for the values of time and distance.

Part 3: y/x is fixed equation is proportional.

Explain the term total distance?

Total distance refers to the actual travel distance between the origin and destination locations of the material.

The formula for the distance is:

Distance = speed * time

Part 1:

The equation formed for the stated condition is:

y = 3x.

Where x is: time in hours.

Where y is: distance in miles.

Part 2: The table is filled for the values of time and distance.

Part 3:

For the equation.

y = 3x.

x = 1, y = 3 : y/x = 3

x = 2, y = 6 ; y/x = 3

As, y/x is fixed equation is proportional.

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The complete question with table is attached.

If you add 21 to my number, multiply the result by 3, you will get 84 more than 2/3 of my number what is my number?

Answers

Step-by-step explanation:

x = my number

3(x + 21)

multiply sum of 21 and my number by 3

=

(2/3)x + 84

84 more than 2/3 of my number

3(x + 21) = (2/3)x + 84

9(x + 21) = 2x + 3×84 = 2x + 252

9x + 189 = 2x + 252

7x + 189 = 252

7x = 63

x = 9

my number is 9.

Can someone help me with this problem, please


THANKS

Answers

Answer:

30%

Step-by-step explanation:

3 pizzas = 30 slices.  count yellow 1+6+2 = 9

9/30 = 30%

A bridge is to be built across a small lake from a gazebo to a dock (see figure). The bearing from the gazebo to the dock is S 41° W. From a tree x = 90 meters from the gazebo, the bearings to the gazebo and the dock are S 74° E and S 28° E, respectively. Find the distance from the gazebo to the dock. (Round your answer to the nearest whole number.)

Answers

Solving the triangle we found the distance between the gazebo and the dock is: 69.34 meters. The answer is explained below:

Solving the triangle:

The first thing to know is that to solve any triangle you must know at least one side and two other elements that can be sides or angles, that is, at least three elements of the six that make up a triangle.

Now, in the problem we know the value of one side (90 m) and 3 angles (see attached image), therefore the calculation of the distance (one side) is very easy if we apply the law of sines:

According to the Law of Sines, the ratio of the length of the sides of a triangle (not a rectangle) and their respective opposite angle sines, is the same value. Then:

Unknown variable = distancia (d)Opposite angle = 46°

d / sen (46°) = 90 m / sen (69 °)  

After, we pass  sen (46°) to the second term of the equation.

d= sen(46°)*90 m / sen (69°)

d = 0,7193*90/ 0,9335

d = 69,34 m

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A smoking cessation program was organized for 623 employees of a company, and 216 successfully stopping smoking. What was
the approximate ratio of successes to failures?
A) 1 to 2
B) 2 to 3
C) 3 to 1
D) 4 to 2

Answers

Answer:

A) 1 to 2

Step-by-step explanation:

Total number of people: 623

Successes: 216

Failures: 623 - 216 = 407

Ratio of successes to failure = 216/407

Since 216 is approximately half of 407, the ratio is approximately 1/2.

Answer: A) 1 to 2

a salad dressing recipe uses 10 parts oil,4 parts vinegar,and 2 parts honey.Which of the following sets of ingredients are in a proportional relationship with the recipe?select all that apply.

Answers

According to the information, the sets of ingredients that have a proportional relationship with the original recipe are: option A, C and D.

How to check the proportional relationship of the ingredients with the recipe?

To check the proportional relationship of the ingredients with the recipe we must carry out the following procedure.

Option A.

First, we need to establish how many times 6 is in 12 because this recipe includes 6 parts oil and the original recipe includes 12 parts oil.

12 / 6 = 2

Once we identify this number, we must divide the amounts of the original recipe by 2 to identify if the other values are correct.

3 / 2 = 1.52 / 2 = 1

In accordance with the above, option 1 would be proportional to the main recipe. For the other options we must perform the same procedure:

In the case of case C. we identify that 24 is twice 12, so we would have to multiply each ingredient by 2 to check the proportional relationship

3*2=62*2=4

In the last case (option D), we identify that the proportion is 3/4 with respect to the original recipe, so we must carry out the same procedure keeping this proportion in mind.

12 / 4 = 33*3=9

3 / 4 = 0.750.75 * 3 = 2.25

2 / 4 = 0.50.5 * 3 = 1.5

Note: This question is incomplete because there is some information missing. Here is the complete information:

Attached image

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The graph of the function f shown in the figure above has horizontal tangents atx=3 and x=6. Ifg(x)=∫02xf(t)dtwhat is the value ofg′(3)?(A) 0 (B)−1(C)−2(D)−3(E)−6

Answers

The horizontal tangents at x=3 and x=6 on the graph of the function f are shown in the given image. If [tex]g(x)=\int\limits^{2x}_0 {f(t)}\;dt[/tex], then g'(3) is -2. Then, option (C) is correct.

A function's zero slopes is indicated by a horizontal tangent line that runs parallel to the x-axis. The given graph of function f has horizontal tangents at x =3 and x = 6. Then, the given function is [tex]g(x)=\int\limits^{2x}_0 {f(t)}\;dt[/tex]. Then, we have to find g'(3). It is clear from the graph that f(3) = -3 and f(6) = -1.

Then, applying the Leibnitz rule for differentiation of the given function, we get,

[tex]\begin{aligned} g(x) &= \int^{2x}_0 f(t)\;dt\\g'(x)&=f(2x)\cdot\frac{d}{dx}(2x)-f(0)\cdot\frac{d}{dx}(0)\\&=2f(2x)\end{aligned}[/tex]

Now, substituting x = 3 in the above equation, we get,

[tex]\begin{aligned}g'(3)&=2f(2\times3)\\&=2f(6)\\&=2\times -1\\&=-2\end{aligned}[/tex]

The required answer is -2.

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What is an equation of the line that passes through the point (6,-4)(6,−4) and is perpendicular to the line 2x-y=52x−y=5?

Answers

The line that connects the coordinates (6, 4) and is perpendicular to the line 2xy=5 has the equation =y=1/2x-1.

What are straight-line equations?

The general equation for every straight line is y = mx + c, where m is the gradient (or degree of steepness) of the line and c is the y-intercept (the point in which the line crosses the y-axis).

The variables x and y are related to coordinates on the line in the linear equation y = mx + c.

The formula y = mx + c yields a result for y when we enter a value for x.

As y depends on the value of x, it follows that x is an independent variable and y is a dependent variable.

According to our question-

a line equation that is perpendicular to the line 2xy=5 and passes through the point (6, 4)

The slope of the given equation 2x-y=5 is first determined.

The line's equation is y=mx+b. where'm' represents the slope

Hence, The line that connects the coordinates (6, 4) and is perpendicular to the line 2xy=5 has the equation =y=1/2x-1.

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A triangular prism has a base that is an isosceles right triangle with sides ​,9 ​,9 and 12.7. The height of the prism is . What is the surface area of this​ prism

Answers

The surface area of the triangular prism is 55.8 units²

What is Triangular Prism

A triangular prism is a three-dimensional shape with two triangular faces and three rectangular faces. It is also known as a tetrahedron, which is a type of polyhedron with four faces. The triangular prism has a total of six faces and nine edges.

The formula of surface area of triangular prism is given as;

S.A = 2A + PH

A = Area of triangular baseP = perimeter of triangleH = height of triangle

The base area of the prism is given as;

A = 1/2 (b * h)

A = 1/2 * (9 * 14)

A = 63 units²

The perimeter of the triangle is the sum of all the sides.

This is calculated as P = a + b + c

P = perimeter = 9 + 9 + 12.7 = 30.7 units

Surface Area = 2(63) + 30.7 * 14

Surface Area = 55.8 units²

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Complete Question:

A triangular prism has a base that is an isosceles right triangle with sides 9 ft, 9 ft, and 12.7 ft. The height of the prism is 14 ft. What is the surface area of this prism.

what is the difference from C to D

Answers

The difference between points C and D is √289 units.

What is Distance formula?

The distance formula is a mathematical formula used to determine the distance between two points in a plane. The formula is:

d = √((x2 - x1)² + (y2 - y1)²)

"C" and "D" are points in a two-dimensional coordinate system. C is represented by the coordinates (-1, 11) and D is represented by the coordinates (7, -4).

The difference between these two points is the distance between them, which can be calculated using the distance formula:

√((x2 - x1)² + (y2 - y1)²)

Where x1, y1 are the coordinates of point C and x2, y2 are the coordinates of point D.

Substituting the values, we get:

√((7 - (-1))² + (-4 - 11)²) = √((8)² + (-15)²) = √(64 + 225) = √289

Hence, the difference between point C and D is √289 units.

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is 6.26 number types

Answers

I’m sure it’s not number types, but i apologize if i’m wrong

enter the correct 4 digit code

Answers

The code is 4321.

A = 4

B = 3

C = 2

D = 1

Answer the picture below

Answers

Jim spent a total of $125.15 for the 130 miles he traveled in one day at the $14.95 base fee.

what is equation ?

A mathematical equation is a formula that connects two statements using the equal sign (=) to signify equivalence. A mathematical statement demonstrating the equality of two mathematical expressions is the definition of an equation in algebra. For instance, the variables 3x + 5 and 14 are separated by an equal sign in the equation 3x + 5 = 14. Mathematically, the connection between two phrases on either side of a letter is stated. The symbol doubles as the sole variable most of the time. for illustration, 2x - 4 = 2.

given

per mile the cost is $0.85

Base fee is 14.95

0.85x+14.95= 125.15

0.85x=125.15 - 14.95

0.85x = 110 . 92

x= 110 . 92 / 0.85

x= 130. 49

Jim spent a total of $125.15 for the 130 miles he traveled in one day at the $14.95 base fee.

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Hi if anyone can answer that would be great thanks!​

Answers

The value of GL is 161.We can find by using supplementary angles.

What is supplementary angle with example?

Supplementary angles are those angles that sum up to 180 degrees. For example angle 130° and angle 50° are supplementary angles because sum of 130° and 50° is equal to 180°.There are a total of two supplementary quantities and their units.

How do you find supplementary angles?

The sum of two angles is equal to 180° then they are supplementary angles. Each of the angles is said to be a supplement of another angle. Hence we can determine the supplement of an angle by subtracting it from 180°.

Now

According to supplementary angles

GL + LK =180

GL         =180- LK

GL         = 180 -19

GL      = 161

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Reasoning with linear equations

Answers

We can rewrite one side of the given equation using distributive property.

What is distributive property?

The distributive property states that multiplying the sum of two or more addends by a number yields the same outcome as multiplying each addend separately by the number and combining the resulting products.

A, B, and C are the operands in the formula for the distributive property, which is written as a (b + c) = (a b) + (a c). Here, each term enclosed in a bracket multiplies the number outside of it, and the results are added.

The given equation is: 3(x + 2) = 18

Simplifying this,

3*x + 3*2 = 18

3x + 6 = 18

Hence, we can rewrite one side of the given equation using distributive property.

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NEED SOMEOEN THAT KNOWS PRE CALC The endpoints of a diameter of a circle are (7,−4) and (−3,2).

What is the equation of the circle in standard form?

Enter your answer by filling in the boxes. Enter any fractions in simplified form.

Answers

     (x-2)² + ( y + 1)² = 34 is the equation of the circle in standard form.

What is the short definition of a circle?

To put it simply, a circle is a spherical shape without any edges or line segments. In terms of geometry, it has the shape of a closed curve.

                                             The circle's points are set apart from the center by a predetermined amount.

The endpoints of the diameter (7,−4) and (−3,2)

the center of the circle is the midpoint of the diameter.

So, the coordinates of the center  

                      (h,k) = ( 7 + (-3)/2  , -4 +2/2)

                                = ( 4/2 , -1 )

                                 = ( 2 , -1 )

the radius of the circle is just half of the length of the diameter.

So,                 r = 1/2√(-3 -7 )² + ( 2 - (-4))²

                        = 1/2√(10)²  + ( 2 +4 )²

                        = 1/2√100 + 36

                        = 1/2√136

                         = √136/2

                        = 2√34/2

                         = √34

substitute the values of h, k, and r into the standard equation of the circle

                       ( x-h)² + ( y-k)² = r²

                      ( x - 2)² + ( y -(-1))² = (√34)²

                       (x-2)² + ( y + 1)² = 34

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Find an explicit formula for the geometric sequence 3\,,\,15\,,\,75\,,\,375,...3,15,75,375,...3, comma, 15, comma, 75, comma, 375, comma, point, point, point.
Note: the first term should be \textit{a(1)}a(1)start text, a, left parenthesis, 1, right parenthesis, end text.
a(n)=a(n)=a, left parenthesis, n, right parenthesis, equals

Answers

The explicit formula for this geometric sequence 3, 15, 75, 375... is aₙ = 3(5)ⁿ⁻¹.

How to calculate the nth term of a geometric sequence?

In Mathematics, the nth term of a geometric sequence can be calculated by using this mathematical expression:

aₙ = a₁rⁿ⁻¹

Where:

aₙ represents the nth term of a geometric sequence.r represents the common ratio.a₁ represents the first term of a geometric sequence.

Note: The nth term of a geometric sequence is equal to the explicit formula for the geometric sequence.

Next, we would determine the common ratio as follows;

Common ratio, r = a₂/a₁

Common ratio, r = 15/3

Common ratio, r = 5.

Now, we can calculate the nth term (explicit formula) of this geometric sequence as follows:

aₙ = a₁rⁿ⁻¹

aₙ = 3(5)ⁿ⁻¹

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Complete Question:

Find an explicit formula for the geometric sequence 3, 15, 75, 375...

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