Chapter 1 - 1.7 - Linear Inequalities in One Variable - 1.7 Exercises - Page 137: 71

a) $[-2,4]$. b) $(-\infty,4]$.

Part a. From the graph, the values of $x$ that satisfy the inequality $0\leq y\leq3$ are $[-2,4]$. Part b. From the graph, the values of $x$ that satisfy the inequality $y\geq0$ are $(-\infty,4]$.