find the slope between the following points (-6,6) and (-6, -1)

Question

i dont really understand this because if there's two points (for example, (1,4 and 3,4) isn't there only one point in the middle?

Answer 1

slope = rise/run = (y2 - y1)/(x2 - x1)

slope = (-1 - 6)/(-6 - -6)

slope = -7/0 = undefined

These two points represent a vertical line and the slope is undefined.