please help solve & with graphs.

1. Solve these problems using graphical linear programming and answer the questions that follow. Use simultaneous equations to determine the optimal values of the decision variables. a. Maximize z=4x1+3x2 Subject to b. Maximize Z=2x1+10x2 Subject to DurabilityStrengthTime10x1+4x21x1+6x21x1+2x2x1,x240wk24psi14hr0 c. Maximize Z=6A+3B (revenue) Subject to MaterialMachineryLabor20A25A+20B20A+30B6B1,000hr1,200hrA,B600lb0 (1) What are the optimal values of the decision variables and Z ? (2) Do any constraints have (nonzero) slack? If yes, which one(s) and how much slack does each have? (3) Do any constraints have (nonzero) surplus? If yes, which one(s) and how much surplus does each have? (4) Are any constraints redundant? If yes, which one(s)? Explain briefly