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misal : x = 1 pensil
y = 1 buku
maka :
8x = y → y = 8x
5x+3y = 77.000
5x+3.(8x) = 77.000
5x+24x = 77.000
29x = 77.000
x = 77.000 : 9
x = 2.655,17 ~ x = 2.700
b)
x = 2.700 → y = 8x = 8.(2700)
= 21.600
jadi, 6y+10x
= 6.(21600)+10.(2700)
= 129.600+27.000
= 156.600