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I need help with the following problem. Thank you! Let f(x, y) = 3/x + 4/y + 5x + 6y in the region R where

I need help with the following problem. Thank you!

Let f(x, y) = 3/x + 4/y + 5x + 6y in the region R where r, y > 0. Explain why f must have a global minimum at some point in R (note that R is unbounded---how does this influence your explanation?). Then find the global minimum. minimum =

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