I would like to know how will i be able to find out slop of line in 3d. Following are the points
A(10, 4, 6) B(8, 6, 8)

I got the formula from google, but i dont know how to use it plz help me out.

slope= (x-x0)/a = (y-y0)/b = (z-z0)/c

what are "a" "b" and "c" how to find these values..and how to use this formula..plz help me out.