1.Find the slope of each line which contains each pair of points listed below. (a) (0,0) and (8,4) (b) (10,5) and (6,78) (c) (2,-2) and (4,2) (d) (0,3) and (-2,3) (e) (-2,0) and (0,6) (f) (15,6) and (-2,23)