Answer
-$\frac{1}{4}$
Work Step by Step
x-y
Replace x with $\frac{7}{8}$ and y with $\frac{9}{8}$
$\frac{7}{8}$ - $\frac{9}{8}$
=-$\frac{2}{8}$
=-$\frac{2\times 1}{2\times4}$
=-$\frac{1}{4}$
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