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If x2 - 2xy = 84 and x - y = -10, what is the value of |y|?
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sandy
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Joined: 07 Jun 2014
Posts: 4804
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
If x2 - 2xy = 84 and x - y = -10, what is the value of |y|? [#permalink] New post  19 May 2018, 16:18
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If \(x^2 - 2xy = 84\) and \(x - y = -10\), what is the value of \(|y|\)?

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mohan514
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Joined: 26 Jan 2018
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GRE 1: Q165 V156
Re: If x2 - 2xy = 84 and x - y = -10, what is the value of |y|? [#permalink] New post  27 May 2018, 05:50
1
(x-y)^2 =100
84+|y| ^2 =100
y = + or -4

Hence the answer
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