35. f(x, y) = 12 + 5y - 20x on the polygon in Figure 22(A). 40. Find OSXS 36. f(x, y ) = 3x - 6y - 8 on the domain where |x | + ly| $ 3. In tion on t 41. f(x (0, 2) (4, 11) 42. f( (-3, 0) (1, 0) ( 2 , 7 ) (8, 7) 43. f (4, 6) 44. f (7, 4 ) 45. (0, -4) (3, 1) -X 46. (A) (B) 47. FIGURE 22 48. 37. Assumptions Matter Show that f(x, y) = xy does not have a 49 global minimum or a global maximum on the domain 50 migov tinu old D = {(x, y) : 0