Answer
Refer to Graph I and by way of Vertical Line Test, it is a function.
The domain is $(–\infty, \infty)$.
The range is $(–\infty, \infty)$.
Work Step by Step
Refer to Graph I and by way of Vertical Line Test,
it is a function because each vertical line drawn will not intersect the curve on the graph in more than one point.
The x-values of the points on the curve will include all the real numbers between $–\infty$ and $\infty$. The domain is $(–\infty, \infty)$.
The y-values of the points on the curve will include all the real numbers between $–\infty$ and $\infty$. The range is $(–\infty, \infty)$.
