What is the slope of the line that passes through the points (6, -5) and (6,−4)?

Answer 1

the slope through the two given points is undefined

(6,-4) and (6, -5)

have slope = "rise over run" = difference in y divided by difference in x = (-4--5)/(6-6) = 1/0 which is undefined

the slope is either - infinity or + infinity, both are undefined and not any real number

the line through the two points is

x=6, vertical line, with undefined slope