Question

What is the solution to the linear system of equations?
x + 4y = –8
x – y = 7

Answer 1

A.

(4, –3)








B.
(4, 3)







C.
(7, 0)







D.
The system has no solution

Answer 2

Hey cancel x

Answer 3

what?

Answer 4

It will be 1st option

Answer 5

wait so its c?

Answer 6

cancel x

Answer 7

im sorry I really don't understand :/

Answer 8

can someone help me?

Answer 9

subtract one equation from the other

Answer 10

okay, wait a minute ill do that

Answer 11

wait what would they be?

Answer 12

First you solve both equations to get x. In this case, that would be -4y-8 and y+7. Since they both equal x, they equal each other. You use the equation -4y-8=y+7 to solve for y, which is -3. Knowing that, you plug -3 into one of the original equations. You solve that to get x=4, so it's A.

Answer 13

oh okay well that's not to hard, thank you for the clear explanation!