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Math Help - I need help

  1. #1
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    I need help

    This is super easy to some of you but I can't seem to figure this out.

    r = m/l + n/k

    solve for m
    Last edited by ihatemath123; April 5th 2012 at 10:42 AM.
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  2. #2
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    Re: I need help

    Quote Originally Posted by ihatemath123 View Post
    This is super easy to some of you but I can't seem to figure this out.

    r = m/l + n/k

    solve for m
    \displaystyle \begin{align*} r &= \frac{m}{l} + \frac{n}{k} \\ r - \frac{n}{k} &= \frac{m}{l} \\ \frac{k\,r - n}{k} &= \frac{m}{l} \\ \frac{l\left(k\,r - n\right)}{k} &= m \\ m &= \frac{k\,l\,r - l\,n}{k}  \end{align*}
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  3. #3
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    Re: I need help

    r = m/l + n/k

    You want to isolate m. So, first you move n/k to the other side. r - n/k = m/l. Multiply both sides by l. rl - (nl/k) = m.
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