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Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
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Re: x and y

by x2suresh » Sun Feb 22, 2009 6:44 am
4meonly wrote:x^2*y + x*y^2 < 0?

(1) xy<0
(2) x<0
x^2*y + x*y^2 < 0
--> xy (x+y)<0

(1) xy<0

x+y can be -ve or +ve
x=2 y=-3 --> -ve
x=-2 y=3 --> +ve
not sufficient

(2)
x<0
we don't the value of y.
x^2*y + x*y^2 < 0 or >0
not sufficient

combined

x<0 y>0

xy (x+y)<0
x=-2 y=3 xy (x+y)>0
x=-3 y=2 xy (x+y)<0

Not sufficient

E.
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Master | Next Rank: 500 Posts
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GMAT Score:720

by mjjking » Sun Feb 22, 2009 10:36 am
Good explanation xsuresh, I agree with you!

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