2. Solve these problems using graphical linear programmi Explain briefly, low. Use simultaneous equations to determine the optimat and then answer the queutions that fol. a. Z=1.80S+2.20TSubjectto:Potassium5S+8T200grCarbohydrate15S+6T240grProtein4S+12T180grTT10grS,T0 b. MinimizeZ=2x1+3x2Subjectto:D4x1+2x220E2x1+6x218F1x1+2x212x1,x20 (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 hine? (3) Do any constraints have (nonzero) surplus? If yes, which one(s) and bow mach surplus does each have? (4) Are any constraints redundant? If yes, which one(s)? Explain briefly