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# What is the value of xy ? (1) y = x – 2 (2) y + 2 = x^3

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Math Expert
Joined: 02 Sep 2009
Posts: 43863
What is the value of xy ? (1) y = x – 2 (2) y + 2 = x^3 [#permalink]

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03 Sep 2017, 04:36
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Difficulty:

35% (medium)

Question Stats:

81% (00:51) correct 19% (00:39) wrong based on 41 sessions

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What is the value of xy ?

(1) y = x – 2
(2) y + 2 = x^3
[Reveal] Spoiler: OA

_________________
Math Expert
Joined: 02 Aug 2009
Posts: 5660
Re: What is the value of xy ? (1) y = x – 2 (2) y + 2 = x^3 [#permalink]

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03 Sep 2017, 07:20
Bunuel wrote:
What is the value of xy ?

(1) y = x – 2
(2) y + 2 = x^3

Hi..

Clearly each statement alone is insufficient , so let's see combined

y=x-2 or x=y+2
Also $$x^3=y+2..........so...x=x^3.....x^3-x=0.....x(x^2-1)=0$$
So x can be 0,1 or -1
And for X=0, y =x-2=-2.... Irrespective of y, xy=0
x=1, y=1-2=-1..xy=-1
Insufficient

E
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Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

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Re: What is the value of xy ? (1) y = x – 2 (2) y + 2 = x^3   [#permalink] 03 Sep 2017, 07:20
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