Intermediate Algebra for College Students (7th Edition)

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

Chapter 5 - Cumulative Review Exercises - Page 402: 4

Answer

$(2,3)$.

Work Step by Step

The given compound inequality is $2x+4\lt10$ and $3x-1\gt5$. Solve each inequality separately. First $2x+4\lt10$. Subtract $4$ from both sides. $\Rightarrow 2x+4-4\lt10-4$ Simplify. $\Rightarrow 2x\lt6$ Divide both sides by $2$. $\Rightarrow \frac{2x}{2}\lt\frac{6}{2}$ Simplify. $\Rightarrow x\lt3$ Second $3x-1\gt 5$ Add $1$ to both sides. $\Rightarrow 3x-1+1\gt5+1$ Simplify. $\Rightarrow 3x\gt6$ Divide both sides by $3$. $\Rightarrow \frac{3x}{3}\gt\frac{6}{3}$ Simplify. $\Rightarrow x\gt2$ First graph the solution set of each inequality We can write the solution set of the compound inequality. $x\lt3$ as $(-\infty,3)$ and $x\gt2$ as $(2,\infty)$ Then take the intersection of the two solution sets. The intersection is $(-\infty,3)\cap(2,\infty)=(2,3)$. The combined graph is shown below.
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