Refer:https://www3.nd.edu/~zxu2/acms40390F12/Lec-7.3.pdf
Jacobi Method:
Jacobi iterative method is an algorithm for determining the solutions of a diagonally dominant system of linear equations. Each diagonal element is solved for, and an approximate value is plugged in. The process is then iterated until it converges.

Gauss–Seidel method:
Gauss–Seidel method, also known as the Liebmann method or the method of successive displacement, is an iterative method used to solve a linear system of equations.