#### Answer

$-\frac{x+y}{x-y}$

#### Work Step by Step

$\frac{(a-3)(x+y)}{(3-a)(x-y)}=\frac{-(3-a)(x+y)}{(3-a)(x-y)}=-\frac{3-a}{3-a}\times\frac{x+y}{x-y}=-1\times\frac{x+y}{x-y}=-\frac{x+y}{x-y}$

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

$-\frac{x+y}{x-y}$

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