Solve for x
x=\frac{13-y}{4}
Solve for y
y=13-4x
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4x=13-y
Subtract y from both sides.
\frac{4x}{4}=\frac{13-y}{4}
Divide both sides by 4.
x=\frac{13-y}{4}
Dividing by 4 undoes the multiplication by 4.
y=13-4x
Subtract 4x from both sides.
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