Question

is an undefined slope horizontal or vertical

Answer 1

vertical

Answer 2

Vertical. Imagine slopes as the y of a function divided by the x of a function.

Answer 3

since dividing by 0 is undefined; if x never moves then y/x is simply undefined

Answer 4

look off into the horizon; its horizontal

Answer 5

I like your explanation better even though infinity doesn't show it's ugly head for a while.Nice pic btw.

Answer 6

:)