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

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

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New post 27 Mar 2019, 01:49
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Difficulty:

  55% (hard)

Question Stats:

33% (00:48) correct 67% (00:50) wrong based on 27 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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Re: Is x=3? 1) x^2=9 2) x=y^2/7; y is real  [#permalink]

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New post 27 Mar 2019, 09:12
AsadAbu wrote:
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
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Re: Is x=3? 1) x^2=9 2) x=y^2/7; y is real  [#permalink]

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New post 27 Mar 2019, 17:59
AsadAbu wrote:
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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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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