Find an equation of a plane containing the points P (2,-1, 1), Q (5, 0, -1), and R (-2, 3, 3). 5x + y + 8z = -17 -5x + y + 8z = 17 5x = y + 8z = 17 3x + 3y + 8z = 17 3x - 3y + 8z = 17 3x-3y - 8z = 17 5x + y = 8z = 17 5x + y + 8z = 17 O O