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                       (b)    Find the inverse matrix,  A . Hence, solve the above system of linear equations.
                                                 1  4 5
                                                          
               40.     (a)    Given matrix  A         4 0 2 , find the cofactor and adjoint for the matrix. Hence,
                                                          
                                                   8  0 3  
                                    
                              find  A .
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                       (b)    Find the values of   ,   ,    and    in the following matrix equation.

                                3 7     x   2     4  2y
                                       3              
                                6 1     5  z    5w   7  
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