using mathematica/ mathlab/ maple to write and run a program to solve y\' =(4-ty

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If you just run the line Solve[{x + y == 27, x y == 180}, {x, y}] then everything runs fine and you find {{x -> 12, y -> 15}, {x -> 15, y -> 12}}. The error you see is because somewhere you've got a statement like In[1]:= x + y = 27 During evaluation of In[1]:= Set::write: Tag Plus in x+y is Protected. >> Out[1]= 27 Where the head of x + y is Plus which is a protected symbol and can't be naively given new definitions. It might be that you have some weird definition hiding somewhere, in which case, it's simplest to restart the kernel and try again. The moral of the story is that = (Set) is not the same as == (Equal).

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