Question

Find the slope between points (-3, 5) and (-3, 8).

A. -8/5
B. 8/5
C. 0
D. unidentified slope

Answer 1

Hint: the x coordinates are the same

Answer 2

D

Answer 3

what does that tell you about the line that goes through the two points?

Answer 4

thats their unidentified

Answer 5

but why is it undefined

Answer 6

the points (-3, 5) and (-3, 8) lie on a vertical line

this vertical line cuts through x = -3 on the x axis

Answer 7

all vertical lines have an undefined slope

this is because the "run" is 0

slope = rise/run

slope = rise/0 ... can't do it, you can't divide by zero

slope = undefined

Answer 8

That explanation deserves a medal.

Answer 9

thanks