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Math Help - Solving for a variable

  1. #1
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    Solving for a variable

    This is the problem that I cannot figure out, I am awful at solving for variables. If someone could please explain this to me it would be much appreciated!

    Solve for L:

    V=9L/(L-4N)

    This is what I did, which was incorrect:

    V(L-4N)=9L


    VL-4NV=9L

    VL=9L+4NV

    VL-9L=4NV

    L-9L=4NV/V

    -8L=4NV/V

    L=4NV/(-8V)

    L=NV/(-2V)
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  2. #2
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    Re: Solving for a variable

    Quote Originally Posted by RalphNader View Post
    This is the problem that I cannot figure out, I am awful at solving for variables. If someone could please explain this to me it would be much appreciated!

    Solve for L:

    V=9L/(L-4N)

    This is what I did, which was incorrect:

    V(L-4N)=9L


    VL-4NV=9L

    VL=9L+4NV

    VL-9L=4NV

    L(V-9) = 4NV

    now finish it ...
    ...
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  3. #3
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    Re: Solving for a variable

    Ooooh, factoring out the L, thank you!

    L = 4NV/(V-9)

    It was correct
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  4. #4
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    Re: Solving for a variable

    Quote Originally Posted by RalphNader View Post
    VL-9L=4NV

    L-9L=4NV/V
    Can you see what you did wrong in that step?
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