Question

In order to solve the following system of equations by addition, which of the following could you do before adding the equations so that one variable will be eliminated when you add them?

4x-2y=7
3x-3y=15

A.Multiply the top equation by 3 and the bottom equation by 4
B.Multiply the top equation by 3 and the bottom equation by 2
C.Multiply the top equation by -3 and the bottom equation by 2
D.Multiply the top equation by 1/3.

Answer 1

C

Explanation:

Answer 2

In order to solve the following system of equations by addition, we multiply both equations with a factor that will eliminate one variable. From the choices listed above, I believe the correct answer is option C. We have to first multiply the top equation by -3 and the bottom equation by 2. Doing such will eliminate the y variable term.