Answer
To do the proof, we simplify the expression:
$\frac{a}{b} = \frac{c}{d} $
We add b/b to one side and d/d to the other, for both of these equal one:
$\frac{a}{b} + \frac{b}{b} = \frac{c}{d} + \frac{d}{d} \\ \frac{a+b}{b} = \frac{c+d}{d} $
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 227: 39
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