Solve for x
x=\frac{y-450}{30}
Solve for y
y=30\left(x+15\right)
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30x=y-450
Subtract 450 from both sides.
\frac{30x}{30}=\frac{y-450}{30}
Divide both sides by 30.
x=\frac{y-450}{30}
Dividing by 30 undoes the multiplication by 30.
x=\frac{y}{30}-15
Divide y-450 by 30.
y=450+30x
Swap sides so that all variable terms are on the left hand side.
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