If `A=[1-1 1 2 1-3 1 1 1],` find `A^(-1)` and hence solve the system of linear equation. `x+2y+z=4,-x+y+z=0,x-3y+z=2`

Explanation

### Step-by-Step Solution

Given matrix \( A \) and system of linear equations:

\[ A = \begin{bmatrix} 1 & -1 & 1 \\ 2 & 1 & -3 \\ 1 & 1 & 1 \end{bmatrix} \]

System of equations:
\[ x + 2y + z = 4 \]
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