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# If xy does not equal zero, what is the value of xy? (1)

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Intern
Joined: 30 Apr 2010
Posts: 22
Location: Texas
Schools: University of Texas - TEMBA
If xy does not equal zero, what is the value of xy? (1)  [#permalink]

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14 May 2010, 16:08
2
00:00

Difficulty:

(N/A)

Question Stats:

83% (00:42) correct 17% (02:33) wrong based on 86 sessions

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If xy does not equal zero, what is the value of xy?

(1) (2/x) + (2/y) = 3

(2) x^3 – (2/y)^3 = 0

I thought the answer was D because:

S1. (2/2) + (2/1) = 3 & (2/1) + (2/2) = 3
x = 2 y = 1
x = 1 y = 2
xy = 2

S2. x^3 = (2/y)^3
x^3 = 8 / (y^3)
x^3y^3 = 8
xy = 2

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VP
Joined: 05 Mar 2008
Posts: 1390

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14 May 2010, 16:32
1
TXTDryFly wrote:
If xy does not equal zero, what is the value of xy?

(1) (2/x) + (2/y) = 3

(2) x^3 – (2/y)^3 = 0

I thought the answer was D because:

S1. (2/2) + (2/1) = 3 & (2/1) + (2/2) = 3
x = 2 y = 1
x = 1 y = 2
xy = 2

S2. x^3 = (2/y)^3
x^3 = 8 / (y^3)
x^3y^3 = 8
xy = 2

x could = 1/2 and y could = -2 so xy = -1
Manager
Joined: 16 Feb 2010
Posts: 129

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15 May 2010, 08:42
yup statement 1 can lead to more than 1 value for xy hence rejected
Non-Human User
Joined: 09 Sep 2013
Posts: 11396
Re: If xy does not equal zero, what is the value of xy? (1)  [#permalink]

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09 Jun 2019, 11:49
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If xy does not equal zero, what is the value of xy? (1)   [#permalink] 09 Jun 2019, 11:49
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