fiendex wrote:

If x + 2y + 1 = y - x, what is the value of x?

1) y² = 9

2) y = 3

1) y² = 9 so y = +3 or -3 and both values generate different answer for the value of x, hence insufficient, A and D gone

2) y=3 so this will give us only single value of x, remember solving for the value of x is not required, we know seeing x + 2y + 1 = y - x that if we know y , we will get the value of x...

IMO B

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