The corner points of the feasible region determined by the system of linear constraints are (0, 10), (5, 5), (15, 15), (0, 20). Let Z = ax + by, where a, b > 0. Condition on a and b so that the maximizing value of Z occurs at both the points (15, 15) and (0, 20) is:
1
a = b
2
a = 2b
3
b = 2a
4
More than one of the above
5
None of the above