Solve for P
\left\{\begin{matrix}P=\frac{U}{R}\text{, }&U\neq 0\text{ and }R\neq 0\\P\neq 0\text{, }&R=0\text{ and }U=0\end{matrix}\right.
Solve for R
R=\frac{U}{P}
P\neq 0
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RP=U
Variable P cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by P.
\frac{RP}{R}=\frac{U}{R}
Divide both sides by R.
P=\frac{U}{R}
Dividing by R undoes the multiplication by R.
P=\frac{U}{R}\text{, }P\neq 0
Variable P cannot be equal to 0.
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