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HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Sun Apr 10, 2011 4:59 am

If X and Y are integers, does x = y?
1) xy = y^2
2) x^2 = y^2

First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.

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Source: Beat The GMAT — Data Sufficiency | Sun Apr 10, 2011 4:59 am

force5: Legendary Member; Posts: 582; Joined: Tue Mar 08, 2011 12:48 amFollowed by: 6 members; Thanked: 61 times; GMAT Score:740

by force5 » Sun Apr 10, 2011 5:18 am

IMO- c

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vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 amFollowed by: 34 members; Thanked: 156 times; GMAT Score:720

by vineeshp » Sun Apr 10, 2011 5:22 am

1) xy = y^2
xy - y^2 = 0 --> y (x-y) = 0.
y =0 or x=y.
NS.
If y =0, x can take any number.

2) x^2 = y^2
x =3, y=-3.
NS.

Combined.
From 1,
y =0 or x=y
If y=0, then x also equals 0 as x^2 = y^2. x=y
otherwise x =y.

So C

Vineesh,
Just telling you what I know and think. I am not the expert.

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