please help this one

4. [15] (a)[8] Find the equation of the plane paling points A = (2,3,1) and B = (0, 11 1)1 and parallel to the line, which is the intersection between the plane a: + y + z = 3 and the plane y z + 21' = 2. (b)[?] Let A = (11 2, 1), B = (2, 3,2) be two points in R3. Let the line L1 passing through A and B. Let the parametric equations of line L; be :12: 1215, 3:: 2H, z: 3t+2. Here i E II! is the parameter. Calculate the distance between L1 and L2