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a) 6x + 4y = 24 => 3x + 2y = 12
b) 3x + 6y = 18 => x + 2y = 9
nomor 4
3x + 2y ≤ 12, x + 2y ≥ 9, x ≥ 0
nomor 5
3x + 2y ≥ 12, x + 2y ≤ 9, y ≥ 0