3. (a) (10 points) Find the point where the line through P(2, 1, 1) and Q(3, 3, 0) intersects the plane 3x - y + 2z = 8 (b) (10 points) Given the two lines with equations L1: x = -1+2t, y =1-t. 2 = 1 + 2t, L2: 1 = 1. y = 6+3r. 2=5+r. are they parallel, are they skew, or do they intersect? Explain, and if they intersect give the point of inter