Answer
The given relation represents $y$ as a function of $x$.
domain: $(-\infty, +\infty)$
range:$(-\infty, +\infty)$
Work Step by Step
RECALL: Vertical Line Test
If all vertical lines will pass through the graph of a relation in at most one point only, then the relation defines $y$ as a function of $x$.
To know if the given graph represents $y$ as a function of $x$, perform the vertical line test.
Note that all vertical lines will pass through the given graph at one only point . This means that the graph pass the vertical line test.
Thus, the given relation represents $y$ as a function of $x$.
The graph covers all x-values so the domain is $(-\infty, +\infty)$.
The graph covers all y-values so the range is $(-\infty, +\infty)$.