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: 46

Answer

$[-\displaystyle \frac{19}{6}, \infty)$

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{4x-3}{6}+2\geq\frac{2x-1}{12}\qquad $ ... $/\times 12$ ... ($\times $ LCD) $ 2(4x-3)+24\geq 2x-1\qquad $ ... distribute $8x-6+24\geq 2x-1$ $ 6x+18\geq-1 \qquad $ ... $/-2x+18$ $ 6x\geq-19\qquad $ ... $/\div 6$ $ x\displaystyle \geq-\frac{19}{6}$ The solution set is $[-\displaystyle \frac{19}{6}, \infty)$
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