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celana = c
eliminasi pertama mencari b, dengan menyamakan c:
2b + c = 140.000 (x2) → 4b + 2c = 280.000
3b + 2c = 235.000 (x1)→ 3b + 2c = 235.000
_______________ -
b = 45.000
eliminasi keuda mencari c, dengan menyamakan d
2b + c = 140.000 (x3)→6b + 3c = 420.000
3b + 2c = 235.000 (x2)→6b + 4c = 470.000
________________ -
-c = -50.000
c = 50.000
untuk 4b + 5c = ...
→ 4 (45.000) + 5 (50.000)
→ 180.000 + 250.000
→ 430.000