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Math Help - Algebra equation I'm trying to solve.

  1. #1
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    Algebra equation I'm trying to solve.

    Hi,

    I have an equation that I am trying to manipulate for a website project i am working on, but my high school maths is letting me down.

    I am trying to get X on its own.

    This is how far I have got ;

    M*C = (X/V)-O-((X*0.119)+0.2)

    (M*C)+O = (X/V)-((X*0.119)+0.2)
    (M*C)+O = (X/V)-(X*0.119)-0.2
    (M*C)+O+0.2 = (X/V)-(X*0.119)


    Any help/pointers will be greatly appreciated!

    Thanks!

    Robin.
    Last edited by mr fantastic; August 3rd 2011 at 03:21 AM. Reason: Title.
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  2. #2
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    Re: Algebra equation I'm trying to solve, help please!!?

    Quote Originally Posted by gingebot View Post
    Hi,

    I have an equation that I am trying to manipulate for a website project i am working on, but my high school maths is letting me down.

    I am trying to get X on its own.

    This is how far I have got ;

    M*C = (X/V)-O-((X*0.119)+0.2)

    (M*C)+O = (X/V)-((X*0.119)+0.2)
    (M*C)+O = (X/V)-(X*0.119)-0.2
    (M*C)+O+0.2 = (X/V)-(X*0.119)
    This last step should be

    (M*C)+O-0.2 = (X/V)-(X*0.119).

    [EDIT]: Missed a minus sign. OP'er was correct here.

    Next step:

    (M*C)+O+0.2 = X(1/V-0.119).

    Can you continue?
    Last edited by Ackbeet; August 3rd 2011 at 04:49 AM.
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  3. #3
    MHF Contributor Siron's Avatar
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    Re: Algebra equation I'm trying to solve, help please!!?

    If the equation is:
    M\cdot C=\frac{X}{V}-O-(X\cdot 0,119+0,2)
    Write, like you did:
    M.C+O=\frac{X}{V}-(X\cdot 0,119+0,2)
    \Leftrightarrow M.C+O=\frac{X}{V}-X\cdot 0,119-0,2
    \Leftrightarrow M.C+O+0,2=\frac{X}{V}-X\cdot 0,119
    \Leftrightarrow M.C+O+0,2=X\cdot \left(\frac{1}{V}-0,119\right)
    ...
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  4. #4
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    Re: Algebra equation I'm trying to solve, help please!!?

    ((M*C)+O-0.2)/(1/V-0.119) = X


    I think!? It's been 12 years since GCSE maths!

    Thanks for the help!

    Robin.
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  5. #5
    A Plied Mathematician
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    Re: Algebra equation I'm trying to solve, help please!!?

    See my edited post. You were correct and I was incorrect regarding the sign of the 0.2. Yes, you would divide through by the (1/V-0.119) as you did, to find X. Note that V cannot equal 1/0.119, or else that denominator would be zero.
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  6. #6
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    Re: Algebra equation I'm trying to solve.

    Thanks guys, it's worked a treat!

    Thanks again for the help!

    Robin.
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  7. #7
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    Re: Algebra equation I'm trying to solve.

    You're certainly welcome for my contribution, whatever that was.
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