Solve for x
x=-\frac{r}{4y}
y\neq 0
Solve for r
r=-4xy
y\neq 0
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r=-4xy
Multiply both sides of the equation by y.
-4xy=r
Swap sides so that all variable terms are on the left hand side.
\left(-4y\right)x=r
The equation is in standard form.
\frac{\left(-4y\right)x}{-4y}=\frac{r}{-4y}
Divide both sides by -4y.
x=\frac{r}{-4y}
Dividing by -4y undoes the multiplication by -4y.
x=-\frac{r}{4y}
Divide r by -4y.
r=-4xy
Multiply both sides of the equation by y.
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