Solve please

Consider the following linear programming problem: Max 7X + 6Y s.t. 18X + 5Y S 90 12X + 6Y s 72 X+YS9 X, Y 20 (a) Use a graph to show each constraint and the feasible region. 15 15 10/ 10/ 5 X X O 10 15 5 10 15 15/ 15 10 10 X X O 10 15 5 10 15 (b) Identify the optimal solution point on your graph. What are the values of X and Y at the optimal solution? ( x, v) = ( (c) What is the optimal value of the objective function