The vectors  and  have their initial points at (1, 1). The value of  so that the vectors terminate on one straight line, is

Since the vectors  have (1, 1) as initial point. Therefore, their terminal points are (3, 4) ad (6, 7) respectively. The equation of the line joining these two points is . The terminal point of  is . Since the vectors terminate on the same straight line. Therefore, point  lies on