Show that the points A(1,3,2),B(-2,0,1) and C(4,6,3) are collinear.

Using distance formula, show that the points (1,5), (2,4) and (3,3) are collinear.

Show that the points A(1,-2,-8),B(5,0,-2)andC(11,3,7) are collinear , and find the ratio in which B divides AC.

Using section formula, show that the points A(2, -3, 4), B(-1, 2, 1) and C(0,1/3,2) are collinear.

Find the value of k if the points A(2,3), B(4,k) and C(6,-3) are collinear.

Prove that the points P(1,2,3),(3,1,7) and (7,-1,15) are collinear.

Show that the points A(1, 2, 7), B(2, 6, 3) and C(3, 10, -1) are collinear.

Find the value of ‘b’ for which the points A(1, 2), B(-1, b) and C(-3, -4) are collinear .

Show that the points (a, 0), (0, b) and (1, 1) are collinear, if (1)/(a)+(1)/(b)=1

Find the direction cosines of the line joining the two points P(-2, 4, -5) and Q(1, 2, 3). 6. Prove that the points (1, 2, 3), (3, 1, 7) and (7, -1, 15) are collinear.