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

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

solve

_k_ = 21
13

k = ______??

I'm stuck...

2. Multiply both sides by 13 and notice how it cancels with the 13 under the division sign ...

$\frac{k}{13} {\color{blue} \times 13} = 21 {\color{blue} \times 13}$
$k = 21 \times {\color{blue} 13}$

3. So k= 273. Right

4. Well, plug it in to your original equation. Does:
$\frac{273}{13} = 21$

If so, then you have the correct solution.