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

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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 \(|y|\)?

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

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

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