3. Determine the intersection (if any) between the following three planes. Give a geometrical interpretation of the situation. Explain how many solutions the situation has (one unique solution, infinite solutions or no solution). The plane that contains the points R (2,1,3), S (-1,2,-1) and T (-1, 5, -4). The plane with the normal (1,1,1) and that contains the point (-2, 1, 2). The plane r= (2,-4, 4) + s(1, -3, 0) ++(0, 1, 1)