Algebra 1

by Hall, Prentice

Published by Prentice Hall

ISBN 10: 0133500403

ISBN 13: 978-0-13350-040-0

Chapter 2 - Solving Equations - Chapter Review - 2-7 and 2-8 Solving Proportions and Using Similar Figures - Page 155: 44

Answer

x = 21

Work Step by Step

$\frac{3}{7}$ = $\frac{9}{x}$ First, use the Cross Products Property. 3x = 7(9) Simplify the right side of the equation. 3x = 63 To find x, divide both sides of the equation by 3. $\frac{3x}{3}$ = $\frac{63}{3}$ x = 21

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