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  • 12-10-2015
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solve by elimination x+3y=-4 + y+x=0

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Аноним Аноним
  • 13-10-2015
x+3y=-4                                  x+3y=-4]
y+x=0    ]multiply minus===> -y-x=0  ]===elimination x===>2y=-4  ==>y=-2 x=2
                   (-)
                                                          
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