Question

Vertical lines have an undefined slope.

True or False

Answer 1

True.

Explanation:

You take 2 points and find gradient of a line and if you get a constant. For example, m=5. Then 5 over 0 (the denominator is what matters, it must be 0) and that's how you know it's a vertical line and has undefined slope.

Answer 2

True

Explanation:

The 'base' of the line has length zero.