Question

What is x?
3x+4y=70
and
8x-3y=9

Answer 1

the \(23^{rd}\) letter in the alphabet..

Answer 2

You can either do elimination or substitution.
Which one are you familiar with

Answer 3

...?

Answer 4

and more elimenation... its easier

Answer 5

you should use elimination

Answer 6

First, decide which variable you are going to get rid of. Which one do you want to eliminate?

Answer 7

how 'bout y?

Answer 8

Ok, so multiply the first equation by 3 and the second equation by 4

Answer 9

Multiply equations by 3 & by 4 respectively, you'll end up with 9x+12y=210, 32x-12y= 36, then you'd be able to do what @jprulz said

Answer 10

https://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/fast-systems-of-equations/v/solving-systems-of-equations-by-elimination

Answer 11

9x+12y=210
and
32x - 12y = 36
?

Answer 12

Yes, then add the two together and y will be gone.

Answer 13

ok. den it is 41x=246?

Answer 14

Solve for x now.

Answer 15

6?

Answer 16

Yes, now plug that into one of the equations to solve for y

Answer 17

ok thanks!!!!

Answer 18

24+4y=70
4y=70-24
i get 11.5

Answer 19

3x+ 4y = 70
8x - 3y = 9

Add them together:
11x + y = 79

Isolate y:

y = 79 - 11x

Substitute y into the first equation:
3x + 4(79 - 11x) = 70
3x + 316 - 44x = 70

Isolate x:
316 - 70 = 44x - 3x
246 = 41x

246/41 = x
6 = x

Substitute back in and solve for y:
3x + 4y = 70
3(6) + 4y = 70
18 + 4y = 70
4y = 70 - 18
4y = 52
y = 52/4
y = 13

Answer 20

@britanny_

Answer 21

yesh?

Answer 22

oh ok that makes sense now !!!!!!!!!!!!!! Thanks!!! Thanks!!! Thanks!!! Thanks!!! Thanks!!!