Need help solving this problem, I am only allowed to use a TI 84 calc I cannot use excel. Need both A and B answered and will upvote, Thanks!

5- (10 pts.) An appliance manufacturer produces two models of microwave ovens: X and Y. Both models require fabrication and assembly work; each unit of X uses 4 bours of fabrication and 2 hours of assembly, and each unit of Y uses 2 hours of fabrication and 6 hours of assembly. There are 600 hours of fabrication and 480 hours of assembly available per day. Each unit of X contributes $40 to profit and each unit of Y contributes $30 to profit. a- Formulate a linear programming model (objective finction and constraints). Maxs.t+40x+304x+42x+400x+x0 b- Use graphical Corners Point technique to find optimal solution and optimal daily profit