Solve for y
y=\frac{x-18}{3}
Solve for x
x=3\left(y+6\right)
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-3y=18-x
Subtract x from both sides.
\frac{-3y}{-3}=\frac{18-x}{-3}
Divide both sides by -3.
y=\frac{18-x}{-3}
Dividing by -3 undoes the multiplication by -3.
y=\frac{x}{3}-6
Divide 18-x by -3.
x=18+3y
Add 3y to both sides.
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