Solve for x
x=\frac{y-90}{6}
Solve for y
y=6\left(x+15\right)
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6x+90=y
Swap sides so that all variable terms are on the left hand side.
6x=y-90
Subtract 90 from both sides.
\frac{6x}{6}=\frac{y-90}{6}
Divide both sides by 6.
x=\frac{y-90}{6}
Dividing by 6 undoes the multiplication by 6.
x=\frac{y}{6}-15
Divide y-90 by 6.
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