Show that the three points (1,4),(3,-2) and (4,-5) are collinear. Find also the equation of the line on which they lie.

Show that the points A(2,3,4),B(-1,2,-3) and C(-4,1,-10) are collinear. Find the equations of the line in which they lie.

Show that the points (1, 4), (3, - 2) and (- 3,16) are collinear and find the equation of the st. line an which they lie.

Show that the points (1,-1,1),(2,3,1),(1,2,3) and (0,-2,3) are coplanar. Find the equation of the plane in which they lie.

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

Show that the point :- (4, 3), (2, 0) and (- 4,-9) are collinear.

Show that the points (1, 1), (2, 3) and (3, 5) are collinear.

Show that the point :- (4, 2), (7, 5) and (9, 7) are collinear.

Show that the points A(2,3,-4), B(1,-2,3), C(3,8,-11) are collinear.

Find x if the points (2,-5), (-4,5) and (x,15) are collinear.

Find k if the points (2,-3), (k , 1) and (0,4) are collinear.