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# Is x=3? 1) x^2=9 2) x=y^2/7; y is real

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Director
Joined: 23 Feb 2015
Posts: 844
GMAT 1: 720 Q49 V40
Is x=3? 1) x^2=9 2) x=y^2/7; y is real  [#permalink]

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27 Mar 2019, 01:49
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Difficulty:

65% (hard)

Question Stats:

25% (00:57) correct 75% (00:47) wrong based on 20 sessions

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Is $$x=3?$$
1) $$x^2=9$$
2) $$x=\frac{y^2}{7}$$; y is real

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“The heights by great men reached and kept were not attained in sudden flight but, they while their companions slept, they were toiling upwards in the night.”
Math Expert
Joined: 02 Aug 2009
Posts: 7560
Re: Is x=3? 1) x^2=9 2) x=y^2/7; y is real  [#permalink]

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27 Mar 2019, 09:12
Is $$x=3?$$
1) $$x^2=9$$
2) $$x=\frac{y^2}{7}$$; y is real

Is $$x=3?$$
1) $$x^2=9$$
x can be 3 or -3
insuff

2) $$x=\frac{y^2}{7}$$; y is real
7x=$$y^2$$, so x cannot be negative.
Insuff

Combined
x can be just 3
C
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GMAT 1: 790 Q51 V49
GRE 1: Q170 V170
Re: Is x=3? 1) x^2=9 2) x=y^2/7; y is real  [#permalink]

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27 Mar 2019, 17:59
Is $$x=3?$$
1) $$x^2=9$$
2) $$x=\frac{y^2}{7}$$; y is real

Where did this problem come from? I'm curious because I've never seen anything quite like the second statement in an official problem - although real numbers are tested on the GMAT, I haven't really seen a problem that focused on the properties of real numbers (as opposed to imaginary numbers) in this way.
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Chelsey Cooley | Manhattan Prep | Seattle and Online

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Re: Is x=3? 1) x^2=9 2) x=y^2/7; y is real   [#permalink] 27 Mar 2019, 17:59
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