Answer
The given equation is a function.
Work Step by Step
Using a table of values, the graph of the given equation is shown below.
The Vertical Line Test states that if a vertical line intersects the graph of the equation in at most $1$ point, then the equation defines a function.
Since in the graph below, any vertical line such as $x=-1.5$ and $x=0.5$ intersect the graph of the given equation in at most one point, then the given equation defines a function.
