solve _k_ = 21 13 k = ______?? I'm stuck...
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Multiply both sides by 13 and notice how it cancels with the 13 under the division sign ... $\displaystyle \frac{k}{13} {\color{blue} \times 13} = 21 {\color{blue} \times 13}$ $\displaystyle k = 21 \times {\color{blue} 13}$
So k= 273. Right
Well, plug it in to your original equation. Does: $\displaystyle \frac{273}{13} = 21$ If so, then you have the correct solution.
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