Chapter 2 - Solving Linear Inequalities - 2.6 - Solving Absolute Value Inequalities - Exercises - Page 91: 4

$y\leq -4.5$ or $y\geq 4.5$ The graph is shown below.

The given inequality is $\Rightarrow |y|\geq 4.5$ Write a compound inequality. $\Rightarrow y\leq -4.5$ or $y\geq 4.5$ Hence, the solution is $y\leq -4.5$ or $y\geq 4.5$.