Question

Find the value of p for which the points (-1,3),(2,p)and (5,-1) are collinear

Answer 1

Answer:

your answer in the above attachment

Answer 2

Answer :

Since the given points are collinear, the slope of the line joining the points (-1, 3) and (2, p) is equal to the slope of the line joining the points (-1, 3) and (5, - 1).

Thus,

6 (p - 3) = 3 (- 4)

6p - 18 = - 12

6p = - 12 + 18 = 6

Therefore, p = 1