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# If x2 - 2xy = 84 and x - y = -10, what is the value of |y|?

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Retired Moderator
Joined: 07 Jun 2014
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GRE 1: Q167 V156
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Kudos [?]: 2917 [0], given: 394

If x2 - 2xy = 84 and x - y = -10, what is the value of |y|? [#permalink]  19 May 2018, 16:18
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Question Stats:

100% (01:06) correct 0% (00:00) wrong based on 4 sessions
If $$x^2 - 2xy = 84$$ and $$x - y = -10$$, what is the value of $$|y|$$?

[Reveal] Spoiler: OA
4

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Manager
Joined: 26 Jan 2018
Posts: 189
GRE 1: Q165 V156
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Kudos [?]: 132 [1] , given: 3

Re: If x2 - 2xy = 84 and x - y = -10, what is the value of |y|? [#permalink]  27 May 2018, 05:50
1
KUDOS
(x-y)^2 =100
84+|y| ^2 =100
y = + or -4

Re: If x2 - 2xy = 84 and x - y = -10, what is the value of |y|?   [#permalink] 27 May 2018, 05:50
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