Please solve this 2 problems by using Matlab and share the code . it would be great if you can give explanation

Given linear system Ax=B where A=(243216) and B=(28). Let C be the augmented matrix of the system after executing Matlab command rref. Find the element c13. Round the answer to 4 decimal places after the decimal point. Answer: Question 5 Given linear system AX=B where A=8134292336821217,B=1321 and X=x1x2x3x4. Perform 6 iterations of Jacobi's method using the initial approximation X(0)=(0110)T. Find x1 after 6 iterations. Round the answer to 4 decimal places after the decimal point