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