Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 3 - Solving Inequalities - 3-5 Working with Sets - Standardized Test Prep - Page 199: 55



Work Step by Step

Set up a ratio to find the missing length. Since the triangles are similar, the ratio between the lengths of corresponding sides is the same. $\frac{5}{9}=\frac{7}{x}\longrightarrow$ cross multiply $5x=63\longrightarrow$ divide each side by 5 $5x\div5=63\div5\longrightarrow$ divide $x=12\frac{3}{5}$
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