Answer
$\text{Domain: }
\{x|x\le0\}
\\\text{Range: any real number}
$
Work Step by Step
The $x-$values of the given graph are all numbers less than or equal to zero. The $y-$values can be any number. Hence, the given graph has the following characteristics:
\begin{array}{l}\require{cancel}
\text{Domain: }
\{x|x\le0\}
\\\text{Range: any real number}
.\end{array}
