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2013-09-24T20:18:31-03:00
 \left \{ {{x+y=13(-2)} \atop {2x+1,5y=22}} \right.=>  \left \{ {{-2x-2y=-26} \atop {2x+1,5y=22}} \right. \\\\-2y+1,5y=-26+22\\-0,5y=-4\\y=\frac{4}{0,5}\\\boxed{8\ garrafas\ de\ 1,5l}\\\\x+y=13\\x+8=13\\x=\boxed{5\ garrafas\ de\  2l}
2 5 2
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