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Pensil = y
10x + 6y = 14.500 |x5| Jadi : 50x + 30y = 72.500
6x + 5y = 9.750 |x6| Jadi : 36x + 30y = 58.500 -
14x = 14.000
x =
x = Rp. 1000
10x + 6y = 14.500
10 (1.000) + 6y = 14.500
10.000 + 6y = 14.500
6y = 14.500 - 10.000
6y = 4.500
y = = Rp. 750
Berarti 1 Buku = Rp. 1000
1 Pensil = Rp.750
Jika 5x + 4y = 5 (1000) + 4 (750) = 5.000 + 3.000 = Rp. 8000
harga pensil = p
memakai cara eliminasi
10b + 6p = Rp 14.500,00 | ×5| 50b + 30p = 72.500
6b + 5p = Rp 9.750,00 | ×6| 36b + 30p = 58.500
------------------------------ -
14b =14.000
b = 1000
lalu substitusi
10b + 6p = 14.500
10(1000) + 6p = 14.500
10.000 + 6p = 14.500
6p = 14.500 - 10.000
6p = 4.500
p = 750
Harga 5buku dan 4 pensil
= 5b + 4p
= 5(1000) + 4(750)
= 5000 + 3000
= Rp8.000,00