Solve for x
x=3y-4
Solve for y
y=\frac{x+4}{3}
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-3x=12-9y
Subtract 9y from both sides.
\frac{-3x}{-3}=\frac{12-9y}{-3}
Divide both sides by -3.
x=\frac{12-9y}{-3}
Dividing by -3 undoes the multiplication by -3.
x=3y-4
Divide 12-9y by -3.
9y=12+3x
Add 3x to both sides.
9y=3x+12
The equation is in standard form.
\frac{9y}{9}=\frac{3x+12}{9}
Divide both sides by 9.
y=\frac{3x+12}{9}
Dividing by 9 undoes the multiplication by 9.
y=\frac{x+4}{3}
Divide 12+3x by 9.
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