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3a + 2b = 9000 ⇒ 3(b+500) + 2b = 9000 ⇒ 3b + 1500 +2b = 9000
5b + 1500 = 9000 ⇒ 5b = 7500 ⇒ b = 1500, a = 2000
a + 3b? 2000 + 3.1500 = 2000+4500 = 6500
dan harga 1 penggaris Rp, 1.500 dan harga 2 penggaris = 3000