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Sagot :
To solve the given system of equations using an inverse matrix, follow these detailed steps:
### Step 1: Write the system of equations in matrix form.
The system of equations given is:
[tex]\[ \begin{array}{l} x + 5y - 3z = -10 \\ -5x + 6y - 5z = -21 \\ -x + 8y - 8z = -25 \end{array} \][/tex]
This can be written as a matrix equation [tex]\(A \mathbf{x} = \mathbf{B}\)[/tex], where:
[tex]\[ A = \begin{pmatrix} 1 & 5 & -3 \\ -5 & 6 & -5 \\ -1 & 8 & -8 \end{pmatrix}, \quad \mathbf{x} = \begin{pmatrix} x \\ y \\ z \end{pmatrix}, \quad \mathbf{B} = \begin{pmatrix} -10 \\ -21 \\ -25 \end{pmatrix} \][/tex]
### Step 2: Check if the matrix [tex]\(A\)[/tex] is invertible.
To find the solution, we need to check if the matrix [tex]\(A\)[/tex] is invertible. A matrix is invertible if its determinant is non-zero.
(The check has shown that [tex]\(A\)[/tex] is invertible.)
### Step 3: Find the inverse of matrix [tex]\(A\)[/tex].
Since [tex]\(A\)[/tex] is invertible, we can find the inverse [tex]\(A^{-1}\)[/tex]. The solution to the system of equations is given by:
[tex]\[ \mathbf{x} = A^{-1} \mathbf{B} \][/tex]
### Step 4: Perform the matrix multiplication.
Using the inverse of the matrix [tex]\(A\)[/tex] and the vector [tex]\(\mathbf{B}\)[/tex], we perform the multiplication to find the values of [tex]\(x\)[/tex], [tex]\(y\)[/tex], and [tex]\(z\)[/tex].
The calculation yields:
[tex]\[ \mathbf{x} = \begin{pmatrix} 1 \\ -1 \\ 2 \end{pmatrix} \][/tex]
So the solution to the system of equations is:
[tex]\[ x = 1, \quad y = -1, \quad z = 2 \][/tex]
### Step 5: Compare the solution with the given choices.
The given choices were:
1. [tex]\([1, -1, 2]\)[/tex]
2. [tex]\([-6, -5, 2]\)[/tex]
3. [tex]\([-6, -2, -2]\)[/tex]
4. No solution
Comparing the solution [tex]\((1, -1, 2)\)[/tex] with the given choices, we find that it matches choice 1.
### Conclusion:
The solution to the system of equations is [tex]\((1, -1, 2)\)[/tex], which corresponds to choice 1. Therefore, the correct answer is:
[tex]\[ \boxed{1} \][/tex]
### Step 1: Write the system of equations in matrix form.
The system of equations given is:
[tex]\[ \begin{array}{l} x + 5y - 3z = -10 \\ -5x + 6y - 5z = -21 \\ -x + 8y - 8z = -25 \end{array} \][/tex]
This can be written as a matrix equation [tex]\(A \mathbf{x} = \mathbf{B}\)[/tex], where:
[tex]\[ A = \begin{pmatrix} 1 & 5 & -3 \\ -5 & 6 & -5 \\ -1 & 8 & -8 \end{pmatrix}, \quad \mathbf{x} = \begin{pmatrix} x \\ y \\ z \end{pmatrix}, \quad \mathbf{B} = \begin{pmatrix} -10 \\ -21 \\ -25 \end{pmatrix} \][/tex]
### Step 2: Check if the matrix [tex]\(A\)[/tex] is invertible.
To find the solution, we need to check if the matrix [tex]\(A\)[/tex] is invertible. A matrix is invertible if its determinant is non-zero.
(The check has shown that [tex]\(A\)[/tex] is invertible.)
### Step 3: Find the inverse of matrix [tex]\(A\)[/tex].
Since [tex]\(A\)[/tex] is invertible, we can find the inverse [tex]\(A^{-1}\)[/tex]. The solution to the system of equations is given by:
[tex]\[ \mathbf{x} = A^{-1} \mathbf{B} \][/tex]
### Step 4: Perform the matrix multiplication.
Using the inverse of the matrix [tex]\(A\)[/tex] and the vector [tex]\(\mathbf{B}\)[/tex], we perform the multiplication to find the values of [tex]\(x\)[/tex], [tex]\(y\)[/tex], and [tex]\(z\)[/tex].
The calculation yields:
[tex]\[ \mathbf{x} = \begin{pmatrix} 1 \\ -1 \\ 2 \end{pmatrix} \][/tex]
So the solution to the system of equations is:
[tex]\[ x = 1, \quad y = -1, \quad z = 2 \][/tex]
### Step 5: Compare the solution with the given choices.
The given choices were:
1. [tex]\([1, -1, 2]\)[/tex]
2. [tex]\([-6, -5, 2]\)[/tex]
3. [tex]\([-6, -2, -2]\)[/tex]
4. No solution
Comparing the solution [tex]\((1, -1, 2)\)[/tex] with the given choices, we find that it matches choice 1.
### Conclusion:
The solution to the system of equations is [tex]\((1, -1, 2)\)[/tex], which corresponds to choice 1. Therefore, the correct answer is:
[tex]\[ \boxed{1} \][/tex]
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