Nilai maksimum fungsi f(x,y)

Program linier

y  = x
y  = 1
x + y = 6
.
titik potong y = 1  dengan y = x -->  x= 1  --> A(1,1)
titk potong y = 1 dengan x+y = 6 --> x = 5 --> B(5,1)
titk potong y= x dengan x + y = 6 --> x + x = 6
2x = 6 --> x = 3 --> y = 3 --> C( 3,3)

f(x,y) = 4x + 3y
A(1,1) --> f(1,1)= 4+3 = 7
B(5,1) --> f(5,1) = 20 + 3 = 23
C(3,3) --> f(3,3) = 12 + 9 = 21

nilai maksimum = 23