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----------------- :6
x+ 2y = 12...........pers.1
4x+16y =4.16
------------------- :4
x + 4y = 16...........pers.2
eliminasi pers.2 dan 1
x +4y=16
x + 2y=12
-------------- -
2y = 4
y = 2
sub nilai x ke pers.1
x + 2.2= 12
x=8
titik potong (8,2)
titik 1 (16,0)
f1= 16.6= 96
titik 2 (8,2)
f2= 8.6+2.5=48+10=58
titik 3 (0,6)
f3 = 6.5=30
jadi f minimum adalah f3=30 opsi D