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x+y=1200
2x+5y=3000
hacemos reduccion
-2(x+y=1200)......................-2x-2y= -2400
2x+5y=3000......................2x+5y=3000
3y=600......y=600/3.............y=200
si y=200
x+y=1200
x+200=1200
x=1200-200
x=1000
se utilizaron 1000 botellas de 2 litros y 200 botellas de 5 litros