Question

If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step?

x − y = 6
4x − 3y = 12

A. Add the two equations together
B. Multiply the first equation by –4
C. Multiply the first equation by 3
D. Multiply the first equation by –3

I think the answer is D, is that right?

Answer 1

multiply the first equation by -3, then add both equations.