Solve for x
x=y+2
Solve for y
y=x-2
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9x=18+9y
Add 9y to both sides.
9x=9y+18
The equation is in standard form.
\frac{9x}{9}=\frac{9y+18}{9}
Divide both sides by 9.
x=\frac{9y+18}{9}
Dividing by 9 undoes the multiplication by 9.
x=y+2
Divide 18+9y by 9.
-9y=18-9x
Subtract 9x from both sides.
\frac{-9y}{-9}=\frac{18-9x}{-9}
Divide both sides by -9.
y=\frac{18-9x}{-9}
Dividing by -9 undoes the multiplication by -9.
y=x-2
Divide 18-9x by -9.
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