Solve for k
\left\{\begin{matrix}k=\frac{p}{r^{2}}\text{, }&r\neq 0\\k\in \mathrm{R}\text{, }&p=0\text{ and }r=0\end{matrix}\right.
Solve for p
p=kr^{2}
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kr^{2}=p
Swap sides so that all variable terms are on the left hand side.
r^{2}k=p
The equation is in standard form.
\frac{r^{2}k}{r^{2}}=\frac{p}{r^{2}}
Divide both sides by r^{2}.
k=\frac{p}{r^{2}}
Dividing by r^{2} undoes the multiplication by r^{2}.
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