Question

Resolva o sistema:
{x+y+z=4
{2x+y-z=-5
{x-2y+3z=9

Answer 1

Resposta:

{x+y+z=4

{2x+y-z=-5

{x-2y+3z=9

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x+y+z=4 x(-2)

2x+y-z=-5

-2x-2y-2z=-8

2x+y-z=-5

-y-3z=-13

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2x+y-z=-5

x-2y+3z=9 x(-2)

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2x+y-z=-5

-2x+4y-6z=-18

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5y-7z=-23

-y-3z=-13 x(5)

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5y-7z=-23

-5y-15z=-65

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   -22z=-88

  z=-88/-22

   z=4

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-y-3*4=-13

 -y-12=-13

  -y=-13+12

    -y=-1⇒y=1

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x+1+4=4

x=4-5=-1

S={-1,1,4}

Explicação passo-a-passo: