10. Determine the intersection point (if it any) of the following planes: (6 marks) x+y+2z =-2 3x - y+14z =68. Two forces of 40N and 80N act at an angle of 120 to each other. Find the magnitude and direction of the equilibrant force. (Include a diagram representing the forces) (5 marks) 9. Determine the intersection (if any) of the following lines: T = (-8,-5,1) + t(1,4, -1) and r = (3, 0,5) + u(3,-1, 2)