1. The folowing graph shows the feasible region for a LP problem with the folowing objective function: Max 4 X1 5 X2 Please find the optimal solution to this LP prablem and plot the isoprofit line that goes through the aptimal solution. The aptimal solution is X1 The abjective value under the optimal solution is X2 X2 13 (7.12 (15,8 Feasible Region 18,2) (18,0) x1 2. Are the follawings LP models? Please circle Yes ar No No b. No Yes MAX 2X+3Y s.t.x+Y-15 MAX 5X+3Y+4Z s.t. X-Y 15 MAX 6X+3Y s.t. X-Y-15 X+Y 424-40 X,Y-0 X, Y, Z-0