Question: fsolve parameters not solved for in plot


I have a function of 3 variables (PiM) which I can use in plot3d given the first argument while the other two arguments are functions of the two variables I use in plot3d.

In the code I attached below, I am plotting 2 planes using plot3d, but I cannot implicitplot where these two planes intersect. COuld you please take a look at my code?




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