Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 2 - Section 2.4 - Linear Inequalities and Problem Solving - Exercise Set - Page 85: 31

Answer

$[-26\frac{1}{3},\infty)$

Work Step by Step

$\frac{5x+1}{7}-\frac{2x-6}{4}\geq-4$ Solve for x. Multiply each side of the equation by 28 to convert the fractions to whole numbers. $28\times(\frac{5x+1}{7}-\frac{2x-6}{4})\geq-4\times28$ Apply the distributive property. $4(\frac{5x+1}{7})-7(\frac{2x-6}{4})\geq-112$ Apply the distributive property again. $20x+4-(14x-42)\geq-112$ Simplify. $6x+46\geq-112$ Subtract 46 from each side. $6x+46\geq-112$ $6x+46-46\geq-112-46$ $6x\geq-158$ $x\geq-26.3\overline3$ $x\geq-26\frac{1}{3}$ In interval notation this is written as $[-26\frac{1}{3},\infty)$ where [ indicates that the solution set for x includes $-26\frac{1}{3}$.
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