Derry: I’d not come to steal anything. Mr. Lamb: No, no. The young lads steal...scrump the apples. You’re not so young. Derry: I just...wanted to come in. Into the garden. Mr. Lamb: So you did. Here we are, then. Derry: You don’t know who I am. Mr. Lamb: A boy. Thirteen or so. Derry: Fourteen. [Pause] But I’ve got to go now. Good-bye. Mr. Lamb: Nothing to be afraid of. Just a garden. Just me. Derry: But I’m not...I’m not afraid. (Pause) People are afraid of me.
If \[ A = \begin{bmatrix} 1 & 2 & 0 \\ -2 & -1 & -2 \\ 0 & -1 & 1 \end{bmatrix} \] then find \( A^{-1} \). Hence, solve the system of linear equations: \[ x - 2y = 10, \] \[ 2x - y - z = 8, \] \[ -2y + z = 7. \]