Solve for x
x=\frac{y-1}{13}
Solve for y
y=13x+1
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13x=y-1
Subtract 1 from both sides.
\frac{13x}{13}=\frac{y-1}{13}
Divide both sides by 13.
x=\frac{y-1}{13}
Dividing by 13 undoes the multiplication by 13.
y=13x+1
Swap sides so that all variable terms are on the left hand side.
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