6. Determine if the line /, : (x, y, z) = (4,-8,0) + t(7,21,-14) and another line x = 25 - 8s 12 : y = 55 - 24s z=-42+ 16s parallel or coincident [MARK 8] THINKING 7. Find the parametric equations of the line of intersection of the planes [MARK15] 7, :5x - 2y+2-12=0 72 : 3x - y+2z -8=0