Question

What is the slope of the line that passes through the points (0,−6) and (0,−5)? Write your answer in simplest form.

Answer 1

The slope is undefined. Using the slope formula m = (y2−y1)/(x2−x1) gives (−5 − (−6))/(0 − 0) = 1/0, which is undefined (a vertical line x = 0).