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If xy > 0, does (x 1)(y 1) = 1? (1) x + y = xy (2) x = y

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Manager
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Joined: 18 Sep 2004
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Location: Dallas, TX
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GMAT Tests User
If xy > 0, does (x 1)(y 1) = 1? (1) x + y = xy (2) x = y [#permalink] New post 05 Nov 2004, 15:15
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If xy > 0, does (x – 1)(y – 1) = 1?

(1) x + y = xy
(2) x = y
Director
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 [#permalink] New post 05 Nov 2004, 15:37
Maybe is it too obvious but I choose A
GMAT Club Legend
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GMAT Tests User
 [#permalink] New post 05 Nov 2004, 15:57
A

(x – 1)(y – 1) = xy - x - y + 1

1) xy = x + y
substitute in
x + y - x - y + 1
expression you are left out with is 1
sufficient

2) x^2 - x - x + 1
The x's don't cancel out to leave 1 as answer because what you want is when you cancel out everything, you are left with only 1. Only 1) gives you that.
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Best Regards,

Paul

Manager
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Joined: 18 Sep 2004
Posts: 157
Location: Dallas, TX
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GMAT Tests User
 [#permalink] New post 05 Nov 2004, 16:21
Great job, A is OA.

I know this is an easy one but thought there was trick in there,.. with Paul's explanation, there shouldn't be any doubt that A is sufficient.
  [#permalink] 05 Nov 2004, 16:21
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