ibu belanja ke pasar membeli 5 kg jeruk dan 2 kg mangga seharga Rp99.000,00. Hari berikutnya ibu membeli 3 kg jeruk dan 5 kg mangga seharga Rp105.000,00. Jika i

Jeruk disingkat J
Mangga disingkat M

5J + 2M =   99.000   dikali 3 ----> 15J +   6M = 297.000
3J + 5M = 105.000   dikali 5 ----> 15J + 25M = 525.000
                                                     ----------------------------- -
                                                              -19M = - 228.000
                                                                   M = 12.000
5J + 2M = 99.000
5J + 2(12.000) = 99.000
5J + 24.000 = 99.000
5J = 99.000 - 24.000
  J = 75.000 / 5
     = 15.000
jika 2J + 3M = 2(15.000) + 3(12.000)
                    = 30.000 + 36.000
                    = Rp 66.000,-