Solve for x
x=-\frac{y}{9}+\frac{4}{3}
Solve for y
y=12-9x
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-9x+12=y
Swap sides so that all variable terms are on the left hand side.
-9x=y-12
Subtract 12 from both sides.
\frac{-9x}{-9}=\frac{y-12}{-9}
Divide both sides by -9.
x=\frac{y-12}{-9}
Dividing by -9 undoes the multiplication by -9.
x=-\frac{y}{9}+\frac{4}{3}
Divide y-12 by -9.
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