Inverse of matrix

Without using the concept of inverse of a matrix, find the matrix [x y z u] such that [(5,-7),(-2 ,3)][(x ,y),( z, u)]=[(-16,-6 ),(7, 2)] .

Find the inverse the matrix (if it exists)given in [2-2 4 3]

Find the inverse the matrix (if it exists)given in [(2,-2),( 4, 3)]

Find the inverse the matrix (if it exists)given in [(-1, 5),(-3, 2)]

Find the inverse the matrix (if it exists)given in [(1, 2, 3),( 0, 2, 4),( 0, 0, 5)]

Find the inverse the matrix (if it exists)given in [(1, 0, 0),( 0,cosalpha ,sinalpha),(0, sinalpha, -cosalpha)]

Find the inverse the matrix (if it exists)given in [[1, 0, 0],[ 3, 3, 0],[ 5, 2,-1]]

Find the inverse the matrix (if it exists) given in [(2, 1, 3),( 4,-1, 0),(-7, 2, 1)]

Find the inverse the matrix (if it exists)given in [(1,-1, 2),( 0, 2,-3),( 3,-2, 4)]

Find the inverse of the matrix [(3 ,-2 ),(-7 , 5)] .