Solve for x
x=1-3y
Solve for y
y=\frac{1-x}{3}
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3x=3-9y
Subtract 9y from both sides.
\frac{3x}{3}=\frac{3-9y}{3}
Divide both sides by 3.
x=\frac{3-9y}{3}
Dividing by 3 undoes the multiplication by 3.
x=1-3y
Divide 3-9y by 3.
9y=3-3x
Subtract 3x from both sides.
\frac{9y}{9}=\frac{3-3x}{9}
Divide both sides by 9.
y=\frac{3-3x}{9}
Dividing by 9 undoes the multiplication by 9.
y=\frac{1-x}{3}
Divide 3-3x by 9.
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