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Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0

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Joined: 17 May 2015
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Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0  [#permalink]

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08 Apr 2017, 03:10
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15% (low)

Question Stats:

74% (00:43) correct 26% (00:37) wrong based on 177 sessions

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Is $$y = 6$$ ?

(1) $$y^{2} = 36$$

(2) $$y^{2} - 7y + 6 = 0$$

Source: Quant Review 1st Edition
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Joined: 02 Sep 2009
Posts: 58335
Re: Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0  [#permalink]

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08 Apr 2017, 03:51
Is $$y = 6$$ ?

(1) $$y^{2} = 36$$ --> $$y = 6$$ or $$y = -6$$. Not sufficient.

(2) $$y^{2} - 7y + 6 = 0$$ --> $$(y - 6)(y - 1) = 0$$ --> $$y = 6$$ or $$y = 1$$. Not sufficient.

(1)+(2) Intersection of values from (1) and (2) is $$y = 6$$. Sufficient.

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Joined: 06 Dec 2016
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Re: Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0  [#permalink]

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10 Apr 2017, 18:27
1 is insufficient as y = - 6 or 6.
2 is insufficient as y is equal to 6 or 1

1 & 2 combined, y is 6.
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Re: Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0  [#permalink]

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26 Jan 2019, 18:35
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Re: Is y = 6? (1) y^2 = 36 (2) y^2 - 7y + 6 = 0   [#permalink] 26 Jan 2019, 18:35
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