x>y?

[mariah]

Is x > y?
1) x^2 > y^2
2) y - y^2 > 0

oa E
i agree with oa but i don't agree we explanation..

explanation : From II, we cannot determine if Y is positive or not.

how negative number can satisfy second statement ?... i don't get that ...pls explain

[scoobydooby]

i guess stmnt 2 is insufficient as it doesnt mention x, so we cant answer the question: is x>y

[Brent@GMATPrepNow]

Is x > y?
1) x^2 > y^2
2) y - y^2 > 0

oa E
i agree with oa but i don't agree we explanation..

explanation : From II, we cannot determine if Y is positive or not.

how negative number can satisfy second statement ?... i don't get that ...pls explain

You're right.
Statement II definitely tells us that y is positive.
y - y^2 > 0 (first add y^2 to both sides)
y>y^2
Since y^2 must be greater than or equal to 0, we now know that y must be greater than or equal to 0 (i.e., y is positive)