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Math Help - the last problem on my homework page..

  1. #1
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    the last problem on my homework page..

    solve

    _k_ = 21
    13

    k = ______??

    I'm stuck...
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  2. #2
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    Multiply both sides by 13 and notice how it cancels with the 13 under the division sign ...

    \frac{k}{13} {\color{blue} \times 13} = 21 {\color{blue} \times 13}
    k = 21 \times {\color{blue} 13}
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  3. #3
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    So k= 273. Right
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  4. #4
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    Well, plug it in to your original equation. Does:
    \frac{273}{13} = 21

    If so, then you have the correct solution.
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