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2013-11-25T12:09:37-02:00
 \left \{ {{2x+2y=26~(-2)} \atop {6x+4y=72~~~~~~}} \right.

 \left \{ {{-4x-4y=-52} \atop {6x+4y=72}} \right.

2x=20\\x= \frac{20}{2} \\\boxed{x=10}

2x+2y=26\\2y=26-2x\\2y=26-2.10\\2y=26-20\\2y=6\\y= \frac{6}{2} \\\boxed{y=3}

Dimensões iniciais 10 cm e 3 cm
2 5 2