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2014-04-08T19:01:04-03:00
 \left \{ {{2p + q = - 1} \atop {p+q=-(2p+q)}} \right.

 \left \{ {{2p + q = - 1} \atop {p+q=-2p-q}} \right.

 \left \{ {{2p + q = - 1} \atop {3p+2q=0}} \right.

 \left \{ {{2p + q = - 1} .(2)\atop {3p+2q=0}.(-1)} \right.

 \left \{ {{4p + 2q = - 2}\atop {-3p-2q=0}} \right. p=-2

q=-1-2p=-1-2.(-2)=-1+4=3
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