Solve for x
x=\frac{5-y}{4}
Solve for y
y=5-4x
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12x=15-3y
Subtract 3y from both sides.
\frac{12x}{12}=\frac{15-3y}{12}
Divide both sides by 12.
x=\frac{15-3y}{12}
Dividing by 12 undoes the multiplication by 12.
x=\frac{5-y}{4}
Divide 15-3y by 12.
3y=15-12x
Subtract 12x from both sides.
\frac{3y}{3}=\frac{15-12x}{3}
Divide both sides by 3.
y=\frac{15-12x}{3}
Dividing by 3 undoes the multiplication by 3.
y=5-4x
Divide 15-12x by 3.
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