Question 5 a and b part

5. The angle between two planes can also be determined a. Find the angle between the planes given by the equations [z, y, z) = [-2, -7, 5] + s [2, 6, 3] + t [1, 4, -1] and [z, y, z = [1, 6, 2 + s [3, 2 5] + t [5, 1, -6] b. Give the equations of two planes that meet at a 90 angle. Explain your reasoning and include a Lan Graph of your planes! Lan Graph