2. Show that the points (-2, 3, 5), (1, 2, 3) and (7, 0, -1) are collinear.
Given three points, A = (-2, 3, 5), B = (1, 2, 3) and C = (7, 0, -1)
The distance between two points and is given by
The distance AB :
The distance BC:
The distance CA
As we can see here,
Hence, we can say that points A,B and C are colinear.