Answer
AT MORE THAN ONE POINT;
FUNCTION.
Work Step by Step
This problem checks your understanding of the vertical line test.
If any vertical line intersects a graph at more than one point, the graph does not define $y$ as a function of $x$
That is simply because the two or more places that the vertical line crosses the graph show that there is more than one value of $y$ for the $x$ the vertical line represents.
