Solve for x
x=\frac{y_{1}-200}{30}
Solve for y_1
y_{1}=30x+200
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30x+200=y_{1}
Swap sides so that all variable terms are on the left hand side.
30x=y_{1}-200
Subtract 200 from both sides.
\frac{30x}{30}=\frac{y_{1}-200}{30}
Divide both sides by 30.
x=\frac{y_{1}-200}{30}
Dividing by 30 undoes the multiplication by 30.
x=\frac{y_{1}}{30}-\frac{20}{3}
Divide y_{1}-200 by 30.
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