Answer
$\dfrac{y-9}{9-y}=-1$
Work Step by Step
$\dfrac{y-9}{9-y}$
Rewrite the expression by changing the sign of the denominator. To do so, also change the sign of the fraction. Then, simplify:
$\dfrac{y-9}{9-y}=-\dfrac{y-9}{y-9}=-1$
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