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Thank you so much Bob!!
The Russians say,"measure the cloth seven times before cutting it once." When I get the same answer he does, I recheck seven times.
Because I had my variables muddled I couldn't see how to write 'z' and 'w' in terms of x and y. So I introduced extras. But look on the bright side. I got your answer. That always makes me feel good!
Revised which is x, y, z, and w. But the simplification goes exactly the same and leads to min-cost = 1800.
Why are you trying to jam this into two variables?
Once again you have found my error.
Isn't x Balt. to Phil. already?
If y = z = 0 then