## Precalculus (6th Edition) Blitzer

RECALL: Vertical Line Test: (i) If all vertical lines pass through at most one point on the graph, then the graph represents $y$ as a function of $x$. (ii) If at least one vertical line passes through more than one point on the graph, then the graph does not represent $y$ as a function of $x$. Thus, the missing expressions in the given statement are: in more than one point; function