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
D: 7x+2y=4 and -4x-2y=-12
2x+y=6 and 7x+y=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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