Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 217: 41


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} $
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