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# If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
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If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y [#permalink]

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15 Oct 2017, 05:15
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Difficulty:

25% (medium)

Question Stats:

66% (00:37) correct 34% (00:24) wrong based on 32 sessions

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If xy = 1, what is the value of x?

1) x and y are positive.
2) x and y are integers.
[Reveal] Spoiler: OA

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If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y [#permalink]

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15 Oct 2017, 05:20
MathRevolution wrote:
If xy = 1, what is the value of x?

1) x and y are positive.
2) x and y are integers.

Statement 1: $$x= 2$$ & $$y=0.5$$ or $$x=0.5$$ & $$y=2$$. Hence no unique solution. Insufficient

Statement 2: $$x=-1$$ & $$y=-1$$ or $$x=1$$ & $$y=1$$ Hence no unique solution. Insufficient

Combining 1 & 2, there is only one possible solution $$x=1$$ & $$y=1$$. Sufficient

Option C

Last edited by niks18 on 15 Oct 2017, 05:22, edited 2 times in total.

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Math Expert
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Re: If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y [#permalink]

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15 Oct 2017, 05:21
MathRevolution wrote:
If xy = 1, what is the value of x?

1) x and y are positive.
2) x and y are integers.

xy=1

lets see the statements

1) x and y are positive.
x can be $$\frac{1}{2}$$ and y as 2 or vice versa
x can be 1 and y too 1
insuff

2) x and y are integers
x and y can be 1 each or -1 each
$$1*1=1$$ and $$-1*-1=1$$
insuff

combined
only possibility is x and y as 1
suff

C
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Kudos [?]: 6405 [0], given: 122

Re: If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y   [#permalink] 15 Oct 2017, 05:21
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# If xy = 1, what is the value of x? 1) x and y are positive. 2) x and y

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