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2. a) 2x + 3y > 5 dan 3x + 2y > 5
gambarnya lihat di bawah
b) 3x - 2y < 1 dan 5x + 3y < 7
gambarnya lihat dibawah ya
3) 2A + B - 3C
= [2 + 2 - 9 - 4 - 4 + 3]
[-6 - 6 + 6 8 + 8 - 18]
= [- 5 - 5]
[-6 -2]