## Prealgebra (7th Edition)

$\frac{1}{14y}$
Convert to like fractions and subtract the numerators. $\frac{5}{7y}-\frac{9}{14y}$ =$\frac{5\times2}{7y\times2}-\frac{9}{14y}$ =$\frac{10}{14y}-\frac{9}{14y}$ =$\frac{1}{14y}$