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Thread: Solve for x

  1. December 1st 2008, 10:03 AM #1
    NeedHelp18
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    Solve for x

    y = 3x / ( 5 + 2x)

    ok im stuck lol

    im at : 2y + 5xy = 3x
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  2. December 1st 2008, 10:35 AM #2
    Moo
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    Hello,
    Quote Originally Posted by NeedHelp18 View Post
    y = 3x / ( 5 + 2x)

    ok im stuck lol

    im at : 2y + 5xy = 3x
    You messed up the factors !

    y=\frac{3x}{5+2x}

    multiply both sides by 5+2x :

    y(5+2x)=3x

    develop :
    5y+2xy=3x

    now group the terms where x appears :

    5y=3x-2xy

    factor :
    5y=x(3-2y)

    hence x=\dots
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