Answer
a) $(-\infty,6]$
b) $\left[-\frac{3}{2},\infty\right)$
Work Step by Step
Part a.
From the graph, the values of $x$ that satisfy the inequality $y\leq5$ is $(-\infty,6]$.
Part b.
From the graph, the values of $x$ that satisfy the inequality $y\geq0$ is $\left[-\frac{3}{2},\infty\right)$.