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?
2x-4y=5
6x-3y=10
A.Multiply the top equation by -3 and the bottom equation by 2.
B.Multiply the top equation by -2.
C.Multiply the top equation by -3.
D.Multiply the top equation by 3 and the bottom equation by 4.

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?
2x-4y=5	
6x-3y=10
A.Multiply the top equation by -3 and the bottom equation by 2.
 B.Multiply the top equation by -2.
 C.Multiply the top equation by -3.
 D.Multiply the top equation by 3 and the bottom equation by 4.

alexishope47 · Answer

I would say C because that would make the top equation -6x+12y=-15 and the -6x from the first equation and the 6x from the second equation would cancel each other out.

makuza123 · Answer

that's correct! thank you @alexishope47