You are required to write a Python program which will solve system of linear equations with 3 unknowns
(to be entered by the user).
Your program should display a menu which will allow the user to choose whether he wants to (1)
coefficients (2) check whether the linear system can be solved using iteration (3) calculate and display the
required results using Gauss-Seidel (4) calculate and display the required results using Gauss-Jacobi
Note that in all cases, the outcomes of the iterations should be displayed. Also if the values of the
unknowns are not converging, your program should stop at the 15th iteration.