Yerp. When the function hits the y [f[X]] axis, then the X value will be 0

Don't see why you dug up an old topic to answer an already answered question, haha.

I guess to add to the multiple answers of this:

The y-axis is pretty much a line defined by the rule: x = 0, that is why y-intercepts are the intersection between x = 0, and the function: y = f(x)