Question

The slope of a line passing through (-9, 10) and (-9, -9) is...

Answer 1

0

Explanation:

It is a horizontal line.

Answer 2

undefined

Explanation:

The slope of a line is found by

m = (y2-y1)/(x2-x1)

= (-9 -10)/(-9 - -9)

= -19/ (-9+9)

= -19/0

We cannot divide by zero so the slope is undefined