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Is xy = 1? (1) x > 1 (2) y^2 = x

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Math Expert
Joined: 02 Sep 2009
Posts: 55230
Is xy = 1? (1) x > 1 (2) y^2 = x  [#permalink]

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07 Sep 2017, 23:51
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Difficulty:

55% (hard)

Question Stats:

59% (01:32) correct 41% (01:00) wrong based on 52 sessions

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Is xy = 1?

(1) x > 1
(2) y^2 = x

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Current Student
Joined: 18 Aug 2016
Posts: 618
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Is xy = 1? (1) x > 1 (2) y^2 = x  [#permalink]

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08 Sep 2017, 00:16
Bunuel wrote:
Is xy = 1?

(1) x > 1
(2) y^2 = x

(1) no info abt y..not sufficient (x,y) (2,1/2) & (2, 4) gives us contradicting answers

(2) tells x is greater than 0

on combining only (x,y) when (1,1) and (1,-1) can satisfy the equation but since we know x>1 hence xy is not equal to 1
Sufficient
C
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Luckisnoexcuse
Is xy = 1? (1) x > 1 (2) y^2 = x   [#permalink] 08 Sep 2017, 00:16
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