In all of the exercises for this section, a software package such as Excel Solver can be used as a check on your analytic work. (Bear in mind, however, the cautions at the end of Example 4.) In Exercises 1-16, find the maximum and minimum values of the given function and the points at which they occur. 1. f(x, y) = x + y; 0x 2,0 y 2 2. g(x, y) = x + y; 1 x 2,1 y 2 3. h(x, y) = (x - 1) + y; x + y 4 4. k(x, y) = x + (y-1); x + y 9