Solve the following system of linear equations by matrix inversion method:
(i) 2x + 5y = -2, x + 2y = -3
(ii) 2x – y = 8, 3x + 2y = -2
(iii) 2x + 3y – z = 9, x + y + z = 9, 3x – y – z = -1
(iv) x + y + z – 2 = 0, 6x – 4y + 5z – 31 = 0, 5x + 2y + 2z = 13