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1. f(x,y)=(0,2) = 20(0)+30(2)=60
2. f(4,0)= 20(4)+30(0)=80
3. eliminasi x+y=4
x+3y=6
------------- -
-2y=-2
y=1
x+y=4
x+1=4
x=3
f(3,1)= 20(3)+30(1)
= 60+30
= 90
nilai maksimum 90.