Test Cramer's rule for a random 4 ( 4 matrix A and a random 4 x 1

Question:

Test Cramer's rule for a random 4 ( 4 matrix A and a random 4 x 1 vector b. Compute each entry in the solution of Ax = b, and compare these entries with the entries in A-1b. Write the command (or keystrokes) for your matrix program that uses Cramer's rule to produce the second entry of x?