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# Is x - y positive ? (1) x > y (2) y - x is negative

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Manager
Joined: 14 Mar 2007
Posts: 240
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Is x - y positive ? (1) x > y (2) y - x is negative [#permalink]  28 Mar 2007, 10:43
3. Is x - y positive ?

(1) x > y
(2) y - x is negative

SVP
Joined: 01 May 2006
Posts: 1816
Followers: 8

Kudos [?]: 88 [0], given: 0

(D) for me

x - y > 0 ?

From 1
x > y
<=> x - y > 0

SUFF.

From 2
y - x < 0
<=> (-1)*(y-x) > (-1)*0 >>> When we mutliply by a negative number, we flip the sign of a inequation
<=> x-y > 0

SUFF.
Director
Joined: 14 Jan 2007
Posts: 783
Followers: 2

Kudos [?]: 50 [0], given: 0

Statement 1 - if x > y :
No matter what are the signs of x and y, if x> y, x-y will always be positive.
so SUFF

Statement 2 - if y-x <0
No matter what are the signs of x and y, if y-x <0, x-y will always be positive.
so SUFF
Manager
Joined: 14 Mar 2007
Posts: 240
Followers: 1

Kudos [?]: 1 [0], given: 0

that's it D. nice guys/:)
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