Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.9 - Linear Inequalities and Absolute Value Inequalities - Exercise Set - Page 138: 45

Answer

The solution set is $[13, \infty)$

Work Step by Step

The idea is to isolate x on one side. Adding, subtracting or multiplying/dividing with a positive number preserves order (the inequality symbol remains the same). Multiplying/dividing with a negative number inverts the order (the inequality symbol changes). --- $\displaystyle \frac{x-4}{6}\geq\frac{x-2}{9}+\frac{5}{18}\qquad $ ... $/\times 18$ ... ($\times $ LCD) $ 3(x-4)\geq 2(x-2)+5\qquad $ ... distribute $ 3x-12\geq 2x-4+5\qquad $ ... $/-2x+12$ $ x\geq 13$ The solution set is $[13, \infty)$
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