Bapak Adi membeli 3 buah scanner dan 1 buah printer dengan harga Rp. 1.850.000,00. Pada toko yang sama ibu Mimin membeli 1 buah scanner dan 2 buah printer denga

misalkan
scanner=x
printer=y

3 scanner+1 printer=1.850.000
3x+y=1.850.000

1 scanner+2 printer=1.350.000
x+2y=1.350.000

3x+y=1.850.000 ➡6x+2y=3.700.000(×2)
x+2y=1.350.000➡x+2y=1.350.000(×1)

kemudian dikurangkan dan hasil 5x=2.350.000
x=2.350.000÷5=470.000

470.000+2y=1.350.000
2y=1.350.000-470.000
2y=880.000
y=880.000÷2=440.000


2 scanner+3 printer=2x+3y=2×470.00+3×440.000=940.000+1.320.000=2.260.000

misal scanner = s
printer = p
3s + p = 1.850.000(×2)
s + 2p = 1.350.000(×1)
6s + 2p = 3.700.000
s + 2p = 1.350.000(-) eliminasi
5s = 2.350.000
s = 2.350.000/5
s= Rp 470.000,00
s + 2p =1.350.000
470.000 + 2p = 1.350.000
2p = 1.350.000 - 470.000
2p = 880.000
p = 880.000/2
p = Rp 440.000,00
jadi harga 2s + 3p = 2×470.000 + 3×440.000
= 940.000 + 1.320.000
= Rp 2.260.000,00