Question

How do you find the slope given (1, 5) and (1, -7)?

Answer 1

See a solution process below:

Explanation:

Because the `x` value for both points is the same, this means;

For each and every value of `y`; `x` will have the same value of `1`.

By definition this is a vertical line.

And, by definition, vertical lines have an undefined slope.