Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 4 - Section 4.2 - Compound Inequalities - Exercise Set - Page 272: 22

Answer

$\varnothing$. The graph is shown below.

Work Step by Step

The given compound inequality is $5(x-2)\gt15$ and $\frac{x-6}{4}\leq -2$. Solve each inequality separately. $\Rightarrow 5(x-2)\gt15$ and $\frac{x-6}{4}\leq -2$. $\Rightarrow 5x-10\gt15$ and $x-6\leq -8$. $\Rightarrow 5x\gt15+10$ and $x\leq -8+6$. $\Rightarrow 5x\gt25$ and $x\leq -2$. $\Rightarrow x\gt\frac{25}{5}$ and $x\leq -2$. $\Rightarrow x\gt5$ and $x\leq -2$. First graph then take the intersection of the solution sets of the two inequalities.. The graph is shown in the image file. We can write the compound inequality. $x\gt 5$ as $(5,\infty)$ and $x\leq-2$ as $(-\infty,-2]$ The intersection is $(-\infty,-2]\cap(5,\infty)=\varnothing$.
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