Question

What is the slope of the line through points (1,9) and (1,-5)?

Answer 1

The pair of points have no slope.

Explanation:

`(1 , 9) = color(blue)(x_1 , y_1)`

`(1 , -5) = color(blue)(x_2 , y_2)`

Slope is calculated using formula:
Slope `= color(blue)((y_2 - y_1)/ (x_2 - x_1)` (change in`y` axis divided by change in `x` axis)

`= (-5-9) /( 1-1)`

`= (-14) /( 0) =` not defined.

The pair of points have no slope.