Show that the points A(1, 2, 7), B(2, 6, 3) and C(3, 10, –1) are collinear.
Given points are A (1, 2, 7), B (2, 6, 3) and C (3, 10, -1)
So,
Since, 
∴ The given points A, B and C are collinear.
20
Show that the points A(1, 2, 7), B(2, 6, 3) and C(3, 10, –1) are collinear.
Given points are A (1, 2, 7), B (2, 6, 3) and C (3, 10, -1)
So,
Since,
∴ The given points A, B and C are collinear.