Solve for x
x=y-6
Solve for y
y=x+6
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3x=3y-18
Subtract 18 from both sides.
\frac{3x}{3}=\frac{3y-18}{3}
Divide both sides by 3.
x=\frac{3y-18}{3}
Dividing by 3 undoes the multiplication by 3.
x=y-6
Divide -18+3y by 3.
3y=3x+18
Swap sides so that all variable terms are on the left hand side.
\frac{3y}{3}=\frac{3x+18}{3}
Divide both sides by 3.
y=\frac{3x+18}{3}
Dividing by 3 undoes the multiplication by 3.
y=x+6
Divide 18+3x by 3.
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