Solve for x
x=\frac{5-y}{3}
Solve for y
y=5-3x
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12x=20-4y
Subtract 4y from both sides.
\frac{12x}{12}=\frac{20-4y}{12}
Divide both sides by 12.
x=\frac{20-4y}{12}
Dividing by 12 undoes the multiplication by 12.
x=\frac{5-y}{3}
Divide 20-4y by 12.
4y=20-12x
Subtract 12x from both sides.
\frac{4y}{4}=\frac{20-12x}{4}
Divide both sides by 4.
y=\frac{20-12x}{4}
Dividing by 4 undoes the multiplication by 4.
y=5-3x
Divide 20-12x by 4.
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