Tolong bantu bagi yang tau

jawab

f(x,y) = 2x + 5y
titik sudut 
(0,3) = 2(0) + 5(3) = 15
(1,4) = 2(1) + 5(4) = 22
(4,3) = 2(4) + 5(3) = 23
(5,0) = 2(5) + 5(0) = 10
nilami maksimum = 23