Resposta:
1 2 1 12
2 1 3 19
3 -1 1 7
L2=L2-2L1
L3=L3-3L1
0 -3 1 -5
0 -7 -2 -29
L2=L2*7
L3=L3*(-3)
0 -21 7 -35
0 21 6 87
L3=L3+L2
0 0 13 52
L3=L3/13
L2=L2/(-7)
0 3 -1 5
0 0 1 4 ==>z=4
L2 ==> 3y-z=5 ==>3y-4=5 ==>y=3
L1==> x +2y+z=12 ==>x+6+4=12 ==>x=2
[tex]\begin{cases}\mathsf{2x+y+3z=19~~~~~I}\\ \mathsf{x+2y+z=12~~~~~~II}\\ \mathsf{3x-y+z=19~~~~~III}\end{cases}[/tex]
Calcular a I com II pelo método da adição
Multiplica a II por -2
[tex]\begin{cases}\mathsf{2x+y+3z=19}\\ \mathsf{-2x-4y-2z=-24}\end{cases}\\ ------------\\ -3y+z=-5~~~IV\\[/tex]
Calcular a I com a III
Multiplicar a I por -3 e a II por 2
[tex]\begin{cases}\mathsf{-6x-3y-9z=-57}\\ \mathsf{6x-2y+2z=14}\end{cases}\\ -----------\\ -5y-7z=-43~~~~V[/tex]
Calcular a IV com a V
[tex]\begin{cases}\mathsf{-5y-7z=-43}\\ \mathsf{-3y+z=-5}\end{cases}[/tex]
Multiplica a IV por 7
[tex]\begin{cases}\mathsf{-5y-7z=-43}\\ \mathsf{-21x+7z=-35}\end{cases}\\ ----------\\ -26y=-78\\\\ y=(-78)\div(-26)\\\\ \boxed{ y=3}[/tex]
Substituir y em:
[tex]-3y+z=-5\\ -3.(3)+z=-5\\ -9+z=-5\\ z=-5+9\\\\\boxed{ z=4}[/tex]
Substituir y e z em:
[tex]x+2y+z=12\\ \\ x+2(3)+4=12\\ \\ x+6+4=12\\ \\ x=12-10\\ \\\boxed{ x=2}[/tex]
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Resposta:
1 2 1 12
2 1 3 19
3 -1 1 7
L2=L2-2L1
L3=L3-3L1
1 2 1 12
0 -3 1 -5
0 -7 -2 -29
L2=L2*7
L3=L3*(-3)
1 2 1 12
0 -21 7 -35
0 21 6 87
L3=L3+L2
1 2 1 12
0 -21 7 -35
0 0 13 52
L3=L3/13
L2=L2/(-7)
1 2 1 12
0 3 -1 5
0 0 1 4 ==>z=4
L2 ==> 3y-z=5 ==>3y-4=5 ==>y=3
L1==> x +2y+z=12 ==>x+6+4=12 ==>x=2
Resposta: x=2 , y=3 e z= 4
Resposta:
[tex]\begin{cases}\mathsf{2x+y+3z=19~~~~~I}\\ \mathsf{x+2y+z=12~~~~~~II}\\ \mathsf{3x-y+z=19~~~~~III}\end{cases}[/tex]
Calcular a I com II pelo método da adição
Multiplica a II por -2
[tex]\begin{cases}\mathsf{2x+y+3z=19}\\ \mathsf{-2x-4y-2z=-24}\end{cases}\\ ------------\\ -3y+z=-5~~~IV\\[/tex]
Calcular a I com a III
Multiplicar a I por -3 e a II por 2
[tex]\begin{cases}\mathsf{-6x-3y-9z=-57}\\ \mathsf{6x-2y+2z=14}\end{cases}\\ -----------\\ -5y-7z=-43~~~~V[/tex]
Calcular a IV com a V
[tex]\begin{cases}\mathsf{-5y-7z=-43}\\ \mathsf{-3y+z=-5}\end{cases}[/tex]
Multiplica a IV por 7
[tex]\begin{cases}\mathsf{-5y-7z=-43}\\ \mathsf{-21x+7z=-35}\end{cases}\\ ----------\\ -26y=-78\\\\ y=(-78)\div(-26)\\\\ \boxed{ y=3}[/tex]
Substituir y em:
[tex]-3y+z=-5\\ -3.(3)+z=-5\\ -9+z=-5\\ z=-5+9\\\\\boxed{ z=4}[/tex]
Substituir y e z em:
[tex]x+2y+z=12\\ \\ x+2(3)+4=12\\ \\ x+6+4=12\\ \\ x=12-10\\ \\\boxed{ x=2}[/tex]
Calculando x + y + z = 2 + 3 + 4 = 9