Question

How do you find the slope and y intercept for `x=4`?

Answer 1

Slope is undefined and there is no y-intercept.

Explanation:

`x=4` represents a vertical line passing through `x=4`.

1] It is not possible to define its slope `m`;
in fact `m=(Deltay)/(Deltax)` but `Deltax=4-4=0` so you get a division by zero!
2] Being a vertical line through `x=4` it will never cross the `y` axis!