Solve for y
y=\frac{4-x_{2}}{3}
Solve for x_2
x_{2}=4-3y
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3y=4-x_{2}
Subtract x_{2} from both sides.
\frac{3y}{3}=\frac{4-x_{2}}{3}
Divide both sides by 3.
y=\frac{4-x_{2}}{3}
Dividing by 3 undoes the multiplication by 3.
x_{2}=4-3y
Subtract 3y from both sides.
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