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a + b = 11000 |×3| 3a + 3b = 33000 ... (2)
------------------------------------------------------- -
2b = 6000
b = 6000 / 2 = 3000 ... (3)
subtitusi nilai b ke persamaan (2)
a + b = 11000
a + 3000 = 11000
a = 11000 - 3000 = 8000 ...(4)
4a + 2b = 4.8000 + 2.3000 = 32000 + 6000 = 38000
jadi uang yang harus dibayar sebanyak Rp. 38.000,00