Solve for l
l=\frac{5}{r}
r\neq 0
Solve for r
r=\frac{5}{l}
l\neq 0
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rl=5
Variable l cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by l.
\frac{rl}{r}=\frac{5}{r}
Divide both sides by r.
l=\frac{5}{r}
Dividing by r undoes the multiplication by r.
l=\frac{5}{r}\text{, }l\neq 0
Variable l cannot be equal to 0.
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