For x=0, does it pass the vertical line test?

1 Answer
Jun 20, 2015

The line x=0 does not pass the 'vertical line test' since the vertical line x=0 intersects with it at more than one point (in fact at rather a lot of points). So x=0 does not define a function.

Explanation:

The equation x=0 defines a vertical line. It does not define a function of x, since there a multiple values of y for the value x=0.