Let a and b be the fourth and fifth digits of your student number. a. Find parametric equations for the intersection of the planes (2a+2)x + (a+1)y - (b+1)z = 3 and (a+1)x + (2a+2)y + (b+1)z = 3.

a) Explain your solution and draw a figure to illustrate it.

b.) Find the acute angle between the two planes