15. Find the point on the graph of z = f(x,y) = x + y closest...

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15. Find the point on the graph of z = f(x,y) = x + y closest to the point (2,2,7). You must show a function to use and demonstrate the calculus "max-min" method. 15. Find the point on the graph of z = f(x,y) = x + y closest to the point (2,2,7). You must show a function to use and demonstrate the calculus "max-min" method.