Solve for x
x=54-3y
Solve for y
y=-\frac{x}{3}+18
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18-\frac{1}{3}x=y
Swap sides so that all variable terms are on the left hand side.
-\frac{1}{3}x=y-18
Subtract 18 from both sides.
\frac{-\frac{1}{3}x}{-\frac{1}{3}}=\frac{y-18}{-\frac{1}{3}}
Multiply both sides by -3.
x=\frac{y-18}{-\frac{1}{3}}
Dividing by -\frac{1}{3} undoes the multiplication by -\frac{1}{3}.
x=54-3y
Divide y-18 by -\frac{1}{3} by multiplying y-18 by the reciprocal of -\frac{1}{3}.
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