If A = [(2,3,4) (1,-1, 0) (0,1,2)], then find A^-1. Hence, solve the system of equations

Question

If A = \(\begin{bmatrix} 2 & 3 & 4 \\ 1 & -1 & 0 \\ 0 & 1 & 2 \end{bmatrix},\) then find A^-1. Hence, solve the system of equations 2x + 3y + 4z = 17; x − y = 3;y + 2z = 7.

Answer 1

System of equations can be written as AX = B,