product of a matrix

product of a matrix

Given that the product of a matrix and the inverse of the matrix yields the UNIT matrix. Solve the simultaneous equation below using the matrix technique.
3x – 4y + 2z = 1
x + 2y – 4z = -7
-2x + 3y + z = 7
i) Express the equation in matrix form
ii) determine the values of x and y and z
product of a matrix