Question

Given equations A and B as 2/5x+y=12 and 5/2y-x=6, respectively, which expression will eliminate variable x?

A.)5/2A+2/5B
B.)5/2A-B
C.)A+2/5B
D.)5/2A-2/5B
E.)25/10A+6/10B

Answer 1

It is C I did the test.

Explanation:

I use Edmentum so I do not know if it works for other online websites but its the answer for Edmentum.

Answer 2

To eliminate variable x multiply A by the coeffitient of variable x in B and multiply B with the coeffitient of variable x in A and subtract the second from the first.
Therefore, the expression that will eliminate variable x is
5/2A - 2/5B