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bukti :
x = > 0 ; y = > 0
x+3y < = 9
jika x = 0 → 0+3y < = 9
3y < = 9
y < = 9/3
y < = 3
jika y = 0 → x+3.0 < = 9
x < = 9
jadi, didapat ttk.(9,3)
2x+y < = 8
jika x = 0 → 2.0+y < = 8
y < = 8
jika y = 0 → 2x+0 < = 8
2x < = 8
x < = 8/2
x < = 4
jadi, didapat ttk.(4,8)