no
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Assume the rational function is in its simplest form (if not, simplify it). If the denominator is a quadratic or of a higher power then it can have more than one roots and each one of these roots will result in a vertical asymptote. So, the graph of a rational function will have as many vertical asymptotes as there are distinct roots in its denominator.
approaches but does not cross
It is an asymptote.
asymptote
Test it by the vertical line test. That is, if a vertical line passes through the two points of the graph, this graph is not the graph of a function.