Solve for x
x=12-3y
Solve for y
y=-\frac{x}{3}+4
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3x=36-9y
Subtract 9y from both sides.
\frac{3x}{3}=\frac{36-9y}{3}
Divide both sides by 3.
x=\frac{36-9y}{3}
Dividing by 3 undoes the multiplication by 3.
x=12-3y
Divide 36-9y by 3.
9y=36-3x
Subtract 3x from both sides.
\frac{9y}{9}=\frac{36-3x}{9}
Divide both sides by 9.
y=\frac{36-3x}{9}
Dividing by 9 undoes the multiplication by 9.
y=-\frac{x}{3}+4
Divide 36-3x by 9.
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