Answer:
D
Step-by-step explanation:
An undefined slope (or an infinitely large slope) is the slope of a vertical line! The x-coordinate never changes no matter what the y-coordinate is! There is no run!
it cannot be written in slope-intercept form,
--So we can rule out A and B, since they are in Slope Intercept Form--
but it can be written in the form: x=a , where a is a constant.
B is not in the form x=a so we can rule that out.
D is in the correct form!
Hope i helped, Brainliest would be appreciated!
Have a nice day!
-Aadi x