Question

In order to solve the following system of equations by subtraction, which of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them? 4x-2y=7 and 3x-3y=15

Answer 1

Multiply the top equation by 3 and the bottom equation by 4.

Explanation:

correct fr, real

Answer 2

I can't see the options, but you would need to multiply (4x - 2y = 7) by 3, and (3x - 3y = 15) by 4 so that you get 12x in both equations. Then when you subtract, you eliminate 12x. I hope this helps!