how do I solve -3x+8y=18 and -x+y=-4
Answers
9514 1404 393
Answer:
(x, y) = (10, 6)
Step-by-step explanation:
Any of the usual methods work to solve this: elimination, substitution, graphing, matrix methods. For a "no-work" solution, I prefer a graphing calculator.
__
In the second equation, both x and y have coefficients of ±1, so substitution or elimination can be used with equal ease. Adding x to the second equation gives an expression for y that can be substituted in the first equation.
y = x -4
-3x +8(x -4) = 18
-3x +8x -32 = 18 . . . eliminate parentheses
5x = 50 . . . . . . . . . add 32, collect terms
x = 10 . . . . . . . . . . .divide by 5
y = 10 -4 = 6 . . . . . use the expression for y to find y
The solution is (x, y) = (10, 6).
Related Questions
Anyone wanna be mutuals?
I’m 14, female, listen to The Arctic Monkeys and Mother Mother, I love the outdoors and art. I am fascinated by criminology and death.
Lmk :)
Answers
Answer:
I'm a girl too but you seem pretty cool lol I'm sure someone will be interested :D And I wish you the best of luck
Step-by-step explanation:
Answer:
me too!! do u like chase atlantic
Step-by-step explanation:
maths very easy class 8
Answers
Answer:
Rs. 333
Step-by-step explanation:
Area of the surface of the cuboidal box to be painted = surface area of the cuboidal box - area of the base
✔️Surface area of the cuboidal box = 2(L*W + W*H + L*H)
L = 6 cm
W = 4 cm
H = 2.5 cm
Surface area of the cuboidal box = 2(6*4 + 4*2.5 + 6*2.5) = 2(24 + 10 + 15) = 2(49)
Surface area of cuboidal box = 98 cm²
✔️Area of base = L*W
= 6*4 = 24 cm²
Area of the cuboidal box to be painted = 98 - 24 = 74 cm²
✔️Cost of painting 74 cm² at Rs. 4.50 per cm² = 74 × 4.50 = Rs. 333
PLZ HELP I GIVE 10 POINTS
Answers
Just break it down and multiply
PLEASE HELP IM GOING TO FAIL WILL GIVE BRAINLESS
Answers
Answer:
x=20
OL=40
Step-by-step explanation:
[tex]\frac{OL}{LQ} =\frac{2}{1} \\OQ=3x=60\\x=20\\OL=2(20)\\OL=40[/tex]
What is the measure of N
Answers
Answer:
No picture sorry
By looking at the calculation below, write down a multiplication fact using the same numbers.
294÷3=98
Answers
Answer:
98 x 3 = 294 or 3 x 98 = 294
Step-by-step explanation:
Since 294 divided by 3 is 98, that means 294 is 3 times 98. So, we can say:
3 x 98 = 294
We can also say that 98 x 3 = 294 since it doesn't matter in which order you multiply.
can someone please help me??
Answers
Answer:
the answer is c ...............
Answer:
It could be A or C because they are the same
Step-by-step explanation:
please helpppppp
Hayden and Jamie completed 20 math problems together. Jamie completed 2 more than twice the number that Hayden completed. Let p represent the number of math problems Hayden completed. Write an equation that can be used to find the number of math problems that Jamie completed.
Answers
Answer:
3p + 2 = 20
Step-by-step explanation:
p = number of math problems Hayden completed
Jamie completed 2 more than = +2
twice the number that Hayden completed = x2
So 2p+2 = number of problems Jamie completed
Since they completed a total of 20 questions, the equation would need another +
(Hayden's problems) + (Jamie's problems) = 20
(p) + (2p+2) = 20
This can be simplified to 3p + 2 = 20, and you can then solve for p
please help me
Find the value of x, given that 4(3x+2)=44.
Answers
Answer:
X=3
Step-by-step explanation:
=> 4(3x+2)=44
=> 12x+8=44 [Multiply the parentheses by 4]
=> 12x=44 - 8 [Transpose 8 of L.H.S to R.H.S]
=> 12x= 36
=> x= (3)
Hope this helps you.
Simplify this expression.
–6w + (–8) + 1 + (–7w)
A. –w – 7
B. –13w – 7
C. w + 9
D. 13w + 9
Answers
Answer:
-13w-7
Step-by-step explanation:
-6w+(-8)+1+(-7w)
-6w-8+1-7w
-6w-7w-8+1
-13w-8+1
-13w-7
Answer:
B. -13w-7
Step-by-step explanation:
First, let's simplify the problem by grouping the like terms together: (-6w), (-7w), and (-8), (1).
Second, now that you know the like terms solve them each individually:
(-6w) + (-7w) = -13w
(-8) + 1 = -7
So your answer is -13w minus -7
4. Leroy creates customized engraved
birthday cards for his schoolmates.
He charges them $0.75 per card, plus a
dollar for each engraved letter in
the recipient's name. The equation
C=0.75 + l describes the cost of a card
in dollars, c, that has a certain number of
letters in the name, l.
Number of Letters
in Name
Cost of Card
(dollars)
3.75
5.75
6.75
8.75
If you have $10.75 to spend on a card,
how many letters can be in the recipient's
name?
Answers
Answer:
10
Step-by-step explanation:
C = 0.75 + L
For L = 3 ; Cost, C = 3.75
3.75 = 0.75 + 3L
3.75 - 0.75 = 3L
3 = 3L
L = 3/3
L = $1
C = 0.75 + 1L
If amount spent is $10.75; C = 10.75
10.75 = 0.75 + L
10.75 - 0.75 = L
10 = L
Number of letters = 10
Find the measure of the missing angle.
Answers
Answer:
68
Step-by-step explanation:
90 - 22
68
I think it’s 68. Since there is a square that means is a 90° angle. 22-90=68.
68 is your answer.
n=3, 3 and 4 I are zeros, f(1)=-68
Answers
Your welcome :)
Mary says that the expression
6 + 8y - 3+ 4y is equivalent to the expression
12y + 3. Is Mary correct?
Answers
Answer:
Yes
Step-by-step explanation:
6 + 8y - 3+ 4y
Add like terms
(8y+4y)+(6-3)
12y+3
Please help me I really don't understand and no one will help me because of these absurd answers....
Answers
80 times 30 plus 60 equals
Answers
Answer:
2460
Step-by-step explanation:
Hope this helps :)
Answer:
the awnser is 2460 have a nice day
Step-by-step explanation:
Josiah earns $7 an hour for washing cars as a summer job. Complete the table of order pairs to show his total earnings for several hours. Then express the relation as a graph. How much would Josiah earn for 12 hours of washing cars?
Answers
Use the GCF and the Distributive Property to find the sum.
14 +21
Answers
Answer:
35
Step-by-step explanation:
14+21=7(2+3)=7(5)=35
Answer:
14+21= 35
Step-by-step explanation:
Find the unknown number in each proportion.
33,264 feet x miles
_______________
5,280 feet x 1 mile,
Answers
Answer:
The unknown number in each proportion.
33,264 feet x miles
_______________
5,280 feet x 1 mile,
is explained below in complete solution.
Step-by-step explanation:
The un-known product in each proportion.
33,264 feet x miles
_______________
5,280 feet x 1 mile,
is 33,264 feet is 6.3 miles.
so the correct answer is 33,264 feet is 6.3 miles. so I hope you found your answer with the accurate explanation that can help you in solving their questions also like this one.
a cereal box says that now it contains 20 more how much cereal comes now
Answers
Answer:
20 more than before
Step-by-step explanation:
Which expression is equivalent to 6x+8?
A 2(3x-4)
B 2(3x+4)
C 2(4x+6)
D 2(3x+8)
Answers
Answer:
B
Step-by-step explanation:
=> 6x+8
We see that 6 and 8 have following factors:
=> 2.3x+2.4
Taking 2 as common, we get
=> 2(3x+4)
This is equivalent to option B
2
882 = 2 x 32 x 72
60 = 22 x 3 x 5
(a) Find the highest common factor (HCF) of 882 and 60.
Answers
Answer:
6
Step-by-step explanation:
60 = 22 × 3 × 5
882 = 2 x 32 x 72
-----------------------------
HCF = 2 x 3
= 6
What is the smaller angle formed by the minute and hour hands at 3:30pm?
[asy]
unitsize(50);
draw(Circle((0,0),1),black+1);
dot((0,0));
for(real i=0;i<360;i+=6){
draw(0.96*(cos(i*pi/180),sin(i*pi/180))--(cos(i*pi/180),sin(i*pi/180)),black+0.5);
};
for(real i=30;i<390;i+=30){
draw(0.93*(cos(i*pi/180),sin(i*pi/180))--(cos(i*pi/180),sin(i*pi/180)),black+0.5);
label(string(i/30),0.83*(sin(i*pi/180),cos(i*pi/180)));
};
real h=3.5; real m=30;
draw(0.65*(sin(pi/6*(h)),cos(pi/6*(h)))--(0,0)--0.9*(sin(pi/30*m),cos(pi/30*m)),black+1,Arrows(TeXHead));
draw(anglemark(dir(-90),origin,dir(-15),5));
[/asy]
Answers
Answer:
75 degrees
Step-by-step explanation:
At 3:30, the hour hand is halfway between the 3 and the 4. The minute hand is exactly on the 6.
There are 360/12 = 30 degrees between each of the marked hours. The angle between the hands covers 2.5 of these gaps, so the angle between the hands is 2.5(30) = 75 degrees.
Hope this helps!
The angle between the hands at 3:30 pm is 90°.
What is the angle between the hands of a clock at 3:30 pm?
At that time, one hand points at the 3, and the other hand points at the 6.
Now, there is a rule to transform time into angles.
We know that a clock has 12 hours in a full revolution, and a circle has 360° in a complete revolution.
Then we know that:
12 hours = 360°
Then:
1 hour = (360°/12) = 30°
So each between each number in the clock we have an angle of 30°.
Then, between 3 and 6 (3 hours) we have:
3*30° = 90°
The angle between the hands at 3:30 pm is 90°.
If you want to learn more about angles, you can read:
https://brainly.com/question/17972372
Please help it's due today!!!
Answers
Answer:
1. option 3
2. option 1
Step-by-step explanation:
look at the picture ...........
Answer:
The first one is 3 and 31/48
The second one is 25
the graph shows the number of girls and boys that were members of the schools debate during 5 years team
Answers
Answer: The number of girls on the debate team increased each year during these 5 years.
Step-by-step explanation:
Ben's living room is a rectangular measuring 12 yards x 204" by how many feet does the length of the room exceed the with the length of the room exceeds the width by blank feet
Answers
Answer:
The length of the room exceeds the width by 19 feet
Step-by-step explanation:
From the question, the room measures 12 yards x 204", that 12 yards x 204 inches. To determine by how many feet the length of the room exceeds the width, we will first convert both units of measurement ( yards and inches) to feet.
To convert 12 yards to feet,
1 yard = 3 feet
∴ 12 yards will be 3 × 12 feet = 36 feet
To convert 204" to feet
12" = 1 foot
∴ 204" will be 204/12 feet = 17 feet
Hence, the room measures 36 feet × 17 feet
That is, Length of the room = 36 feet
and width of the room = 17 feet
Now, to determine by how many feet the length of the room exceeds the width, we will deduct the width of the room from the length of the room, that is,
36 feet - 17 feet = 19 feet
Hence, the length of the room exceeds the width by 19 feet.
a^n+a^n+1
RIGHT ANSWER GETS BRAINLIEST
Answers
Answer:
a^n+a^(n+1)
a^n(1+a^1)=a^n(1+a)
a^n (1+a)
I hope this helped :)
Please give me the correct answer.
Answers
Answer:
C
Step-by-step explanation:
The lake because its constantly increasing at 3 F per hour and at the beach its only 0.5 F per hour. The lake's temperature moved from 71 to 83 in 4 hours which is 12 F in 4 hours which means 3 F per hour. Hence, the lake's temperature was moving at a faster rate.
The clerk at a store worked 45 hours one week.He worked an equal number of hours each day on Monday through Friday.He worked an extra 5 hours on Saturday.How many hours did he work on each weekday
Answers
Answer:
he worked 40 hours on the the weekdays
Step-by-step explanation:
32 people in 8 car's unit rate
Answers
32/8 = 4 people per car
Answer:
32:8
Step-by-step explanation:
simplified it would be 4:1