Question 15 [2 points) 3" Explain why the two planes P1: = [2,5,3] +5[2:1:3]+3[1:\"71), 5,: e R, and P2: > r: (4:4)\")+5[2:'1:3]+3[1:2:3),5,:e R are distinct. Question 16 [4 points) The line segment with endpoints 100:2] and 9(15] is the hypotenuse of a right triangle. The third vertex, R. lies on the line with Cartesian equation '9\" 23" 1= U. a. Determine the coordinates of R. b. Using vectors, show that QPQR is a right triangle