please show all work and explain and must be typed not written in order to be understood

B. A linear programming model is given as follows: Minimize 8x1 +6x2 Subject to 4x12x2 220 -6x14x2 s12 x1 + x2 26 1.x220 (Solve by geometric method, do not use Excel Solver) (a) Define the feasible solution area and obtain the optimal solution graphically (b) if the coefficient of 2 in the objective function decreases to 4 what effect wil be? (c) if the second constraint. -6x1 +4x2 512, is removed from the given model what effect will be? (d) If a new constraint, 4x1 +6x2 524, is added to the given model whatened will be