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y = buku
menghitung x:
4x + 5y = 35.000 | dikali 3
2x + 3y = 20.000 | dikali 5
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12x + 15y = 105.000
10x + 15y = 100.000
--------------------------- --- (dikurang)
2x = 5.000
x = 2.500
menghitung y:
4x + 5y = 35.000 | dikali 2
2x + 3y = 20.000 | dikali 4
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8x + 10y = 70.000
8x + 12y = 80.000
--------------------------- ---
- 2y = - 10.000
y = 5.000
Jawaban pertanyaan:
x + y = 2.500 + 5.000 = 7.500