Question

What is the slope of the line that passes through the points (-10,9) and (-10,18)?

Write your answer in simplest form.

Answer 1

slope = (y₂ - y₁) / (x₂ - x₁)

18-9/-10-10

=9/0

The slope is undefined and it is a vertical line.

Explanation:

OR

since x₂ , x₁ are the same value -10 the slope is undefined.