MathRevolution wrote:

Is x - y > 0?

(1) x > |y|

(2) y = -3

Target question: Is x - y > 0?This is a good candidate for rephrasing the target question.

Aside: Here’s a video with tips on rephrasing the target question: http://www.gmatprepnow.com/module/gmat-data-sufficiency?id=1100Take

x - y > 0 and add y to both sides to get:

x > y?REPHRASED target question: Is x > y? Statement 1: x > |y| First, we know that |y| is greater than or equal to zero.

So, this statement tells us that x is POSITIVE

Second, |y| denotes the MAGNITUDE of y. That is, |y| is y's distance from 0 on the number line.

So, if x > |y|, then this tells us that the MAGNITUDE of x is greater than the MAGNITUDE of y

Since we also know that x is POSITIVE, we can be certain that

x > ySince we can answer the

REPHRASED target question with certainty, statement 1 is SUFFICIENT

Statement 2: y = -3 We have no information about x, so there's no way to determine whether

x > y. So, statement 2 is NOT SUFFICIENT.

Answer =

Cheers,

Brent

_________________

Brent Hanneson – GMATPrepNow.com

Sign up for our free Question of the Day emails