Solve for x
x=\frac{y-500}{80}
Solve for y
y=80x+500
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80x+500=y
Swap sides so that all variable terms are on the left hand side.
80x=y-500
Subtract 500 from both sides.
\frac{80x}{80}=\frac{y-500}{80}
Divide both sides by 80.
x=\frac{y-500}{80}
Dividing by 80 undoes the multiplication by 80.
x=\frac{y}{80}-\frac{25}{4}
Divide y-500 by 80.
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