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Math Help - Realitvely Easy Question

  1. #1
    Newbie
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    Sep 2009
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    Realitvely Easy Question

     <br />
y = 2x <br />
    <br />
5 = x^2 + y^2<br />


    Alright guys, I missed a note, and im tryign to figure out what to do...

    I beleive I use substitution, but im not quite sure how exactly. Can someone quicly run through it for me? Thanks guys.
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  2. #2
    Senior Member
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    Nov 2007
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    5=x^2+(2x)^2=x^2+4x^2=5x^2\Leftrightarrow x^2=1\Leftrightarrow x=\pm 1
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  3. #3
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    You are my hero.
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