Question

Find the slope of (2,-8),(2,5)

Answer 1

the slope is 13.....

Answer 2

the slope between 2 points (x1,y1) and (x2,y2) is
(y1-y2)/(x1-x2)

given
(2,-8) and (2,5)
x1=2
y1=-8
x2=2
y2=5

slope=(-8-5)/(2-2)=-13/0=undefined

the slope is undefined