hello. questions from 'Vector Equation of a Plane' lesson. please help. thank you

6. The plane with the equation r = (1,2,3) + s(1,2,5) + t(1, -1,3), where s, te R intersects the y and z-axes at the points A and B. Determine the equation of the line through the points A and B.2. A plane passes through the points P(-2,3,1), Q(-2,3,2) and R(1,0,1). a) Using PQ and PR as your direction vectors, write the vector equation of this plane. b) Using QR and any other direction vector, write a second vector equation for this plane