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gmatprep.. plz explain

Expert replies
Source: — Data Sufficiency |

by sethids » Thu Sep 11, 2008 2:01 pm
The question stem is whether x - y + 1 > x + y - 1 ?
Subtracting x from both sides, the inequality can be simplified as:
Is 1 - y > y - 1 ?

Stmt1: x > 0. We don't care about the value of x now. Insufficient.

Stmt2: y < 0. If y is negative then 1 - y is positive. and it has to be greater than y - 1 which will always be negative. Sufficient.

B is the answer.
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