Refer to the image below for the graph.
Work Step by Step
The given interval involves a close parentheses. This means that the upper limit (which is $-3$) is not included in the set. The given interval is unbounded on the left. Therefore, the given interval is equivalent to: $x \lt -3$ To graph this on a number line, plot a hollow dot (or a hole) at $-3$, then shade the region to its left. (Refer to the attached image in the answer part above.)