et f(x, y) = 1 + xy + x - 4y and let D be the triangular region in R2 with vertices (1, -4), (9, -4), and (1, 4). Find the absolute maximum and minimum values of f on D. Give all points where these extreme values occur. (Order your answers from smallest to largest x, then from smallest to largest y.) absolute extrema value classification (х, у) -D absolute maximum (х, у) %3D absolute minimum ]) (х, у) %3D absolute minimum

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