13 A ladder is leaning against a wall The base of the ladder is 1 5 m from the base of the wall The top of the ladder touches the wall at a point 4 m above the ground What is the slope of the ladder a Use slopes to determine whether each set of points is collinear or non collinear b If the points are collinear find the slope A 2 1 B 1 2 C 4 2 14 15 M 1 3 N 2 5 P 3 4 16 W 3 1 X 9 8 Z 5 5