math
posted by ReRe .
An objective function and a system of linear inequalities representing constraints are given. Graph the system of inequalities representing the constraints. Find the value of the objective function at each corner of the graphed region. Use these values to determine the maximum value of the objective function and the values of x and y for which the maximum occurs.
Objective Function z = 5x  23y
Constraints 0 ¡Ü x ¡Ü 5
0 ¡Ü y ¡Ü 8
4x + 5y ¡Ü 30
4x + 3y ¡Ü 20

I do not understand your symbols for the constraint functions.
Suspect you are doing a linear programming problem.
I will look up a reference for how to do linear programming. 
Perhaps this will help:
http://people.hofstra.edu/Stefan_Waner/RealWorld/Summary4.html
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