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6b + 5p = 28.000
============
24b + 18p = 108.000
24b + 20p = 112.000
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-2p = -4000
p = 2000
8b + 6p = 36000
8b + 12000 = 36000
b = 3000
5b + 8p = 5 X 3000 + 8 X 2000
= 15.000 + 16.000
= Rp.31.000,00.
misal pensil = y
8x + 6y = 36.000 (dikali 5) menjadi 40x + 30y = 180.000
6x +5y = 28.000 ( dikali 6) menjadi 36x + 30y = 168.000
kita eliminasikan dengan mengurangkannya
4x = 12.000
x = 12.000 : 4
x = 3.000 (harga 1 buku tulis)
8x +6y = 36.000
(8 x 3000) + 6y = 36.000
24.000 + 6y = 36.000
6y = 36.000 - 24.000
y= 12.000 :6
y=2.000 (harga 1 pensil)
jadi harga 5 buku dan 8 pensil adalah
(5x3000) + (8 x 2000)
15.000 + 16.000 = 31.000