Question

Find the slope between points (4, 6) and (-2, 6).

Answer 1

(6-6)/(2-4)=0...so you actually have horizontal line passing through those points

Answer 2

if x1,y1 and x2,y2 are the points then slope is: -\[m=\frac{y_2-y_1}{x_2-x_1}=slope.\]