P = x/(x+y) + (50-x)/(100-x-y)
I want to find the values of x and y that give the max P:
or where dP/d(x,y) = 0
How do I do this calculation?
Thanks for any help - much appreciated.
I know it's an incredibly messy method but from all I know I'd try and get an equation in x or y and substitute...
I've just had an idea, why not do implicit differentiation?