Harga sepasang sepatu dua kali harga sandal. Harga 2 sepasang sepatu dan 3 pasang sendal seharga 420.000,00. Rudy ingin membeli 3 pasang sepatu dan 2 pasang sendal. Uang yang harus dikeluarkan Rudy adalah...
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a= sepatu
b= sendal
2a + 3b= 420.000
2(2b) + 3b = 420.000
4b+3b = 420.000
7b = 420.000
b = 420.000/7 = 60.000
=3a+2b
= 3(2b)+2b
= 8b = 8(60.000) = 480.000
Ibaratkan :
Sepatu = x
Sandal =y
Harga sepatu = 2 kali harga sandal
X=2y
2 sepatu + 3 sandal = 420.000
2×2y + 3y = 420.000
7y = 420.000
y = 60.000
Sepatu = 2y = 2×60.000 =120.000
Sandal = y = 60.000
3 sepatu + 2 sandal = 3×120.000 + 2×60.000
=300.000 +120.000
=420.000