Solve for s
\left\{\begin{matrix}s=-\frac{r}{4y}\text{, }&y\neq 0\\s\in \mathrm{R}\text{, }&r=0\text{ and }y=0\end{matrix}\right.
Solve for r
r=-4sy
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-4ys=r
Swap sides so that all variable terms are on the left hand side.
\left(-4y\right)s=r
The equation is in standard form.
\frac{\left(-4y\right)s}{-4y}=\frac{r}{-4y}
Divide both sides by -4y.
s=\frac{r}{-4y}
Dividing by -4y undoes the multiplication by -4y.
s=-\frac{r}{4y}
Divide r by -4y.
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