Informal Letter
(Your Address)
(City, State, ZIP Code)
(Insert Date)
Dear (Friend’s Name),
I am thrilled to receive your wedding invitation. Congratulations! It fills me with joy to celebrate such a special moment in your life. I am pleased to confirm my presence at the event and look forward to sharing your happiness.
Warm regards,
(Your Name)
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: \[ x - 2y = 10, \] \[ 2x - y - z = 8, \] \[ -2y + z = 7. \]