3) Consider the following LP model (10 min) Max P = x +y subject to (1) 2x + y s8 (2) x + 2y 2 2 (3) 2x - 3y 2-8 (4) x 20 (5) y20 (2,4) (0,2.667) (0,1) a) Which line represents what inequality? (5 marks) (You can use the colors to identify) (4.0) -2 (2.0) b) Will the optimal solution remain unchanged if the right hand side of the constraint 1 changes to 9? Explain