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3a + 10b = 54000 (×4) 12a + 40b = 216000
12a + 12b = 132000
12a + 40b = 216000_
-28b = -84000
b = -84000:(-28)
b = 3000
4a + 4b = 44000
4a + 4(3000) = 44000
4a = 44000 - 12000
4a = 32000
a = 32000 : 4
a = 8000
jadi harga gelas pabrik a = 8000 dan pabrik b = 3000