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Math Help - simplify and elminate y

  1. #1
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    simplify and elminate y

    having trouble with a word problem,

    what i end up with is C = K(x+2y)+2kx

    and xy= 3750, so I know y = 3750/x

    to eliminate y, would the next step be to simplify C=k(x+3750/x) + 2kx?
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  2. #2
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    my error, the next should be C=k[x+2(3750/x)] + 2kx?
    Last edited by colorado; May 25th 2011 at 11:23 AM.
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  3. #3
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    solved, I must have had a brainfart
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