Ok, I think it is not necessary, but I can add it:
The contribution margin is 1.2 monetary units/ units for a first product and 0.9 MU / units for the second product. What is the optimal production schedule for the following constraints when producing from A x ME and B y ME?
On the picture the restrictions (ie the straight lines) can be read off.
In Maxima you type in for example:
which solves the optimization problem (DB=9.9, y=3, x=6)
I hope this helps!
Ps: I don't want to know the answer of the optimal production schedule, because in stack the package "simplex" isn't currently supported. I only want to know how to color the area below the constraints