A linear function f (x, y) = ax + by + c has no critical points. Therefore, the global minimum and maximum values of ƒ (x, y) on a closed and bounded domain must occur on the boundary of the domain. Furthermore, it can be easily seen that if the domain is a polygon, then the global minimum and maximum values of f must occur at a vertex of the polygon. Find the global minimum and maximum values of f (x, y) = 4x - 8y-5 on the domain where |x|+ [y] ≤ 8. (Give your answers as a whole numbers.)

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