Answer
$\text{Set Builder Notation: }
\{x|x\le0\}
\\\text{Interval Notation: }
(-\infty,0]$
Work Step by Step
The given graph shows all the numbers that are less than or equal to $0.$ Hence, the given graph of inequality can be described in the following formats:
\begin{array}{l}\require{cancel}
\text{Set Builder Notation: }
\{x|x\le0\}
\\\text{Interval Notation: }
(-\infty,0]
.\end{array}
