Question

x+2y+3z=7 2x+y+z=-1 -2x-3y+3z=-11

Answer 1

Resposta:

{x+2y+3z=7

{2x+y+z=-1

{-2x-3y+3z-11

---------------------

{x+2y+3z=7 x(-2)

{2x+y+z=-1

-------------------

-2x-4y-6z=-14

2x+y+z=-1

-----------------

-3y-5z=-15

----------------

2x+y+z=-1

-2x-3y+3z=-11

------------------

-2y+4z=-12 x(-3)

-3y-5z=-15  x(2)

-------------------

6y-12z=36

-6y-10z=-30

------------------

-22z=6

z=-6/22=-3/11

-2y+4*(-3/11)=-12

-2y-12/11=-12

-22y-12=-132

-22y=-132+12

-22y=-120

y=120/22=60/11

-------------------

x+2*60/11+3*(-3/11)=7

x+120/11-9/11=7

x+111/11=7

11x+111=77

11x=77-111

11x=-34

x=-34/11

--------------

Prova

-34/11+120/11+3(-3/11)=7

-34/11+120/11-9/11=7

-34/11+111/11=7

77/11=7

7=7(V)

Explicação passo-a-passo: