Undefined. This is a vertical line. One characteristic that makes this a vertical line is that the -coordinate of every point on the line has the exact same -coordinate value, in this case the value 5.
Consider the slope formula:
where and are the coordinates of the given points.
Note that if both of the given points have the identical -coordinates, then the denominator of the slope formula is zero. Anything with a zero denominator is undefined.
John
My calculator said it, I believe it, that settles it
