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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]

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

Posts: 189

GRE 1: Q165 V156

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

27 May 2018, 05:50

(x-y)^2 =100
84+|y| ^2 =100
y = + or -4

Hence the answer

gmatclubot

[#permalink]

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