Solve for x
x=\frac{y-120}{50}
Solve for y
y=50x+120
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50x=y-120
Subtract 120 from both sides.
\frac{50x}{50}=\frac{y-120}{50}
Divide both sides by 50.
x=\frac{y-120}{50}
Dividing by 50 undoes the multiplication by 50.
x=\frac{y}{50}-\frac{12}{5}
Divide y-120 by 50.
y=50x+120
Swap sides so that all variable terms are on the left hand side.
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