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Rp6.600,00 : 4 Salak = Rp1.650
5x+4y=6.600 |x3
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15x+25y=28.250
15x+12y=19.800
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13y =8.450
y =650
3x+5 (650)=5.650
3x+3.250=5.650
3x =5.650-3.250
x =2.400/3
x =800
maka, harga jeruk=Rp 800,00
harga salak=Rp 650,00