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Math Help - Rearranging an equation

  1. #1
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    Talking Rearranging an equation

    This is a really silly question, but I can't seem to do it.

    How do I rearrange
     1000x + 221 \:=\:x\!\cdot\!y

    into
    <br />
x \;=\;\frac{221}{y-1000}<br />

    Thanks
    Last edited by BG5965; September 28th 2008 at 08:23 PM. Reason: Maths formatting error
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by BG5965 View Post
    This is a really silly question, but I can't seem to do it.

    How do I rearrange
     1000x + 221 \:=\:x\!\cdot\!y

    into
    <br />
x \;=\;\frac{221}{y-1000}<br />

    Thanks
    Get terms that contain an x on one side and leave everything else on the other side.

    1000x+221=xy\implies 221=xy-1000x

    Now on the right side, there is a common factor of x.

    Thus 221=xy-1000x\implies 221=(y-1000)x

    Can you take it from here?

    --Chris
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  3. #3
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    Yes I can, thankyou so much.
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