Solve for x
x=\frac{-y-15}{7}
Solve for y
y=-7x-15
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-7x-15=y
Swap sides so that all variable terms are on the left hand side.
-7x=y+15
Add 15 to both sides.
\frac{-7x}{-7}=\frac{y+15}{-7}
Divide both sides by -7.
x=\frac{y+15}{-7}
Dividing by -7 undoes the multiplication by -7.
x=\frac{-y-15}{7}
Divide y+15 by -7.
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