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8x + 6y = 22000
4x + 2y = 10000
8x + 6y = 22000
8x + 4y = 20000
------------------------ -
2y = 2000
y= 1000
4x + 2(1000) = 10000
4x + 2000 = 10000
4x = 8000
x = 2000
10x + 8y = 10(2000) + 8(1000)
= 20000+8000 = 28000
Harga 10 buku dan 8 pensil adalah Rp. 28.000,00