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# If x is not equal to y and if √x = y, what is the value of y

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Manager
Joined: 16 Mar 2016
Posts: 135

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Location: France
GMAT 1: 660 Q47 V33
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If x is not equal to y and if √x = y, what is the value of y [#permalink]

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22 Jun 2016, 13:28
Question : y^3 = x^(3/2) = ? we need x to answer

(1) x=y^x, and from the question we know that x=y^2, so x=2, Sufficient

(2) x^3 = 8, x=2, Sufficient

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Re: If x is not equal to y and if √x = y, what is the value of y [#permalink]

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17 Aug 2017, 22:36
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Re: If x is not equal to y and if √x = y, what is the value of y [#permalink]

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08 Sep 2017, 20:05
kamalkicks wrote:
If x is not equal to y and if $$\sqrt{x}=y$$, what is the value of $$y^3$$ ?

(1) $$x = y^x$$

(2) $$x^3 = 8$$

can somebody explain how 1 is sufficient. i am getting confused...help

Easy. Always try to simplify the stimulus- manipulate the equations in their given form in a granular more clear way.

\sqrt{x}=y - square both sides
x=y^2

St 1

Substitute. Y^2=y^x

suff

St 2

X must be 2- there is no ambiguity since y is to an odd power

D

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Re: If x is not equal to y and if √x = y, what is the value of y   [#permalink] 08 Sep 2017, 20:05

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