It goes like this:

2x+y=6 and 7x+2y=4

After you solve, they then give you 4 choices for which one has the same answer:

A: 2x+y=6 and 3x-y=10

B: 7x+2y=4 and 6x-2y=10

C: 2x+y=6 and -3x-y=-9

and

D: 7x+2y=4 and -4x-2y=-12

2x+y=6 and 7x+y=4

4x+2y=12

-7X+2y=4

-3x=12

x=-4

substituting x you get the value of y as 12

after solving ABCD, the, the value of x in B has the same value of x in D which is 3

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