Question

If a line has no y intercept, can it be described by a function?

Answer 1

It can be described by an equation of the form `x = a`, but not by a function.

Explanation:

If a line has no `y` intercept, then it can only be parallel to the `y` axis and therefore has an equation of the form `x = a` for some constant `a`.

A vertical line fails the vertical line test, has undefined slope and cannot be expressed as a function of `x`.