Question

What is the first step in solving this system by elimination?

2x + 10y = -20
-x + 4y = 28

A. Multiply the first equation by -2.

B. Combine the equations as they are.

C. Multiply the second equation by 2.

D. Multiply the second equation by -4.

Answer 1

You want to try and get rid of one of the variables ( x or y) so you would multiply the second equation by 2 which would make the x variable -2x which then when added to the first equation would eliminate the x variable.

Answer: c. Multiply the second equation by 2.