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Verified answer
Misal :buku = x
pensil = y
3x + 2y = 11.500 | ×3 |
4x + 3y = 16.000 | ×2 |
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9x + 6y = 34.500
8x + 6y = 32.000
-------------------------- -
x = 2.500
3x + 2y = 11.500
3 (2.500) + 2y = 11.500
7.500 + 2y = 11.500
2y = 4.000
y = 2.000
Maka,
2x + y
= 2 (2.500) + 2.000
= 5.000 + 2.000
= 7.000
Jadi,Septi harus membayar sebesar Rp 7.000,00