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QG Quant Review 2nd Edition - Question 73

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turbocharge2010 Just gettin' started!
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QG Quant Review 2nd Edition - Question 73 Post Fri Jun 29, 2012 2:58 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    If x^2 + y^2 = 29, what is the value of (x-y)^2?

    1) xy = 10
    2) x = 5

    OA = A

    So I understand that statement 1 is sufficient. But why isn't statement 2 sufficient? The answer explains that it is because statement 2 doesn't tell us what Y is. Why not? Why can't we substitute x=5 into the equation x^2 + y^2 = 29 to have y = 2? Kindly advise. Thanks!

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    Post Fri Jun 29, 2012 5:06 pm
    y could also equal -2.

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