Please see the attached file for the fully formatted problems.
The plane Π 1 has equation x + 2y - z = 5 and the plane Π 2 has the equation 3x + y + 2z = 10.
(a) Find the angle between the planes.
(b) Find the equation of the line of intersection of the planes.
Plane angle and line of intersection are found. The solution is detailed and well presented.