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3x + 2y ≥ 6
untuk x = 0 maka y
2y = 6
y = 3
untuk y = 0 maka x
3x = 6
x = 2
titik-titik sudutnya f(x,y) = 4x -y
a.) (0,4) = 4(0)-4 = -4
b.) (5,4) = 4(5)-4 = 20-4 = 16
c.) (5,0) = 4(5)-0 = 20
d.) (2,0) = 4(2)-0 = 8
e.) (0,3) = 4(0)-3 = -3
nilai minimumnya -4