x>y ds q

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tj123: Senior | Next Rank: 100 Posts; Posts: 85; Joined: Mon Dec 08, 2008 12:09 am

by tj123 » Sun May 31, 2009 10:10 pm

is x>y?

1) x+y<0

2)x-y>0

OAb

[spoiler] please explain why statement 1 is not suff. If x = -3 and y = -2 then the answer is false, hence suff right? [/spoiler]

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Source: Beat The GMAT — Data Sufficiency | Sun May 31, 2009 10:10 pm

raleigh: Master | Next Rank: 500 Posts; Posts: 103; Joined: Mon May 18, 2009 9:47 am; Thanked: 19 times

by raleigh » Sun May 31, 2009 10:29 pm

Is x>y?

1) x+y<0

2)x-y>0

(1) x + y < 0. The only manipulation you can get from this is that x < -y. This doesn't seem like much help so let's produce a counter example.

Choose x = -1, y = -2. Then x + y = -3 < 0 and x > y.
Choose x = -2, y = -1. Then x + y = -3 < 0 and x < y.

This is insufficient.

(2) x - y > 0. Add y to both sides and we get x > y. This is sufficient. The answer is B.

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aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sun May 31, 2009 10:45 pm

(B)

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