Solve for x
x=\frac{31-2z-y}{3}
Solve for y
y=31-2z-3x
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3x+2z=31-y
Subtract y from both sides.
3x=31-y-2z
Subtract 2z from both sides.
3x=31-2z-y
The equation is in standard form.
\frac{3x}{3}=\frac{31-2z-y}{3}
Divide both sides by 3.
x=\frac{31-2z-y}{3}
Dividing by 3 undoes the multiplication by 3.
y+2z=31-3x
Subtract 3x from both sides.
y=31-3x-2z
Subtract 2z from both sides.
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