Chapter 1: Q38. (page 44)

Solve each inequality. Graph the solution set on a number line.
38. $|6 r - 3| < 21$

Short Answer

Expert verified

Solution of inequality is $- 3 < r and r < 4$

Solution set in number line is

Step by step solution

- Definition of absolute value inequality

For real numbers $a and b$ with b>0

Absolute value inequality is $|a| < b$ when $- b < a and a < b$ , and

Absolute value inequality is $|a| > b$ when $a < - b or a > b$

- Write properties of inequality

Properties of inequalities are written in following table:

- Simplify 6r-3<21

From definition of absolute value inequality, given expression is simplified to

$- 21 < 6 r - 3 and 6 r - 3 < 21$

Use addition and division property of inequality, add with same number does not change the sign of inequality. Also division by same positive number does not reverse the sign of inequality as shown below

$\begin{matrix} - 21 + 3 < 6 r - 3 + 3 and 6 r - 3 + 3 < 21 + 3 \\ - 18 < 6 r and 6 r < 24 \\ - \frac{18}{6} < \frac{6 r}{6} and \frac{6 r}{6} < \frac{24}{6} \\ - 3 < r and r < 4 \end{matrix}$

- Graph the solution set

For $- 3 < r and r < 4$ , number line starts from -3 to 4

Open circle on $- 3 and 4$ shows these points are not included in the solution.

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Solve each inequality. Graph the solution set on a number line.
38. $|6 r - 3| < 21$

Short Answer

Step by step solution

- Definition of absolute value inequality

- Write properties of inequality

- Simplify 6r-3<21

- Graph the solution set

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Solve each inequality. Graph the solution set on a number line.38. 6r-3<21

Short Answer

Step by step solution

- Definition of absolute value inequality

- Write properties of inequality

- Simplify 6r-3<21

- Graph the solution set

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Decision Maths

Statistics

Pure Maths

Probability and Statistics

Logic and Functions

Geometry

Study anywhere. Anytime. Across all devices.

Solve each inequality. Graph the solution set on a number line.
38. $|6 r - 3| < 21$