6 Suppose you have found this optimal tableau (Table 17) for a maximization problem. Use the fact that each nonbasic variable has a strictly positive coefficient in row 0 to show that x1 = 4, x2 = 3, s1 = s2 = 0 is the unique optimal solution to this LP. (Hint: Can any extreme point having s₁ >0 or s₂ >0 have z  =10?)