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

The answer is C.) A+2/5B.
Adding equation A to 2/5B will result in canceling the x terms, i.e. 2/5x + 2/5(-x) = 0.

Answer 2

The answer is C.
If you multiply the second equation by 2/5 the variable x will cancel.