what is the slope of this line? undefined 0

Answer:

undefined

Explanation:

Step1: Recall the slope formula

The slope formula is (m=\frac{y_2 - y_1}{x_2 - x_1}).

Step2: Identify two points on the line

Let's take two points ((-1,4)) and ((-1,-4)) on the vertical line (x = - 1).

Step3: Substitute into the slope formula

(m=\frac{-4 - 4}{-1-(-1)}=\frac{-8}{0}). Division by zero is undefined. So the slope of a vertical line is undefined.