Respostas

  • Usuário do Brainly
2014-03-24T19:54:33-03:00
2x+ y =9______2x=9-y
-x+2y=9_______2x=9-18
-1(9-y)+2y=9____2x=-9
y =9+9___________x =-9/2
y =18_____________x =4,5


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