Consider the following problem, where the values 1 2 c c and have not been ascertained. 1 1 2 2 1 2 1 2 1 2 max .

Consider the following problem, where the values 1 2 c c and have not been ascertained. 1 1 2 2 1 2 1 2 1 2 max . . 2 11 2 2 0, 0 Z c x c x s t x x x x x x          Use graphical method to determine the optimal solution(s) for  x x 1 2 ,  the various possible values of 1 2 c c and . (Hint: Separate the cases where 2 2 2 c c c    0, 0,and 0. For the latter two cases, focus on the ratio of 1 2 c c and )