Solve for x
x=\frac{13-y}{15}
Solve for y
y=13-15x
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13-15x=y
Swap sides so that all variable terms are on the left hand side.
-15x=y-13
Subtract 13 from both sides.
\frac{-15x}{-15}=\frac{y-13}{-15}
Divide both sides by -15.
x=\frac{y-13}{-15}
Dividing by -15 undoes the multiplication by -15.
x=\frac{13-y}{15}
Divide y-13 by -15.
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