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If , then find . Using , solve the system of linear equations given below:
(a)[3.0]
If $A = \begin{bmatrix} 1 & -2 & 0 \\ 2 & -1 & -1 \\ 0 & -2 & 1 \end{bmatrix}$, then find $A^{-1}$.
(b)[1.0]
Using $A^{-1}$, solve the system of linear equations given below:
$x - 2y = -5$
$2x - y - z = -3$
$-2y + z = -4$
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From ISC 2026 Improvement Mathematics Paper 1, question 8(i).