What is the slope of the line that passes through (1, 4) and (1, - 3) ?

7

-7

Undefined

0

(1,4) (1,-3)

notice how ur x's are the same ... they are both 1. When ur x's are the same u have a vertical line with an undefined slope.

just so u know, if ur y's would have been the same, it would have been a horizontal line with a 0 slope.