# the last problem on my homework page..

• April 30th 2008, 04:32 PM
mr_payne2003
the last problem on my homework page..
solve

_k_ = 21
13

k = ______??

I'm stuck...
• April 30th 2008, 04:36 PM
o_O
Multiply both sides by 13 and notice how it cancels with the 13 under the division sign ...

$\frac{k}{13} {\color{blue} \times 13} = 21 {\color{blue} \times 13}$
$k = 21 \times {\color{blue} 13}$
• April 30th 2008, 04:39 PM
mr_payne2003
So k= 273. Right
• April 30th 2008, 04:45 PM
o_O
Well, plug it in to your original equation. Does:
$\frac{273}{13} = 21$

If so, then you have the correct solution.