Question

resolva o sistema a seguir.
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Answer 1

Resposta:

x-2y-2z=-1 ---------x=2y+2z-1

x-y+z=-2 ----------2y+2z-1-y+z=-2 ->y+3z=-1

2x+y+3z=1 -------2.(2y+2z-1)+y+3z=1 ->4y+4z-2+y+3z=1 ->5y+7z=3

y+3z=-1 (.-5)------------>y+3(-1)=-1 ->y=2

5y+7z=3

-5y-15z=5

5y+7z=3 (+)

-8z=8 -> Z=-1

x=2.(2)+2.(-1)-1

x=1