Solve for x_4
x_{4}=31-3y
Solve for y
y=\frac{31-x_{4}}{3}
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x_{4}-1=30-3y
Subtract 3y from both sides.
x_{4}=30-3y+1
Add 1 to both sides.
x_{4}=31-3y
Add 30 and 1 to get 31.
3y-1=30-x_{4}
Subtract x_{4} from both sides.
3y=30-x_{4}+1
Add 1 to both sides.
3y=31-x_{4}
Add 30 and 1 to get 31.
\frac{3y}{3}=\frac{31-x_{4}}{3}
Divide both sides by 3.
y=\frac{31-x_{4}}{3}
Dividing by 3 undoes the multiplication by 3.
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