Answer
$\frac{15-20}{y-4}$=$\frac{-5}{y-4}$
Work Step by Step
$\frac{15}{y-4}$+$\frac{20}{4-y}$=
$\frac{15}{y-4}$+$\frac{20(-1)}{(4-y)(-1)}$=
$\frac{15}{y-4}$+$\frac{-20}{y-4}$=
$\frac{15-20}{y-4}$=$\frac{-5}{y-4}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.4 - Adding and Subtracting Rational Expressions with Different Denominators - Exercise Set - Page 515: 14
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