Solve for z
z=\frac{-y-1}{3}
Solve for y
y=-3z-1
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3z=-1-y
Subtract y from both sides.
3z=-y-1
The equation is in standard form.
\frac{3z}{3}=\frac{-y-1}{3}
Divide both sides by 3.
z=\frac{-y-1}{3}
Dividing by 3 undoes the multiplication by 3.
y=-1-3z
Subtract 3z from both sides.
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