A java program with GUI to implement things about Linear Equation System with Matrix in Linear Algebra. It contains implementation for many function such as Gauss Elimination, Gauss-jordan Elimination, Matrix Inverse with many method, Matrix Determinant, Cramer's rule, Polynomial Interpolation, Bicubic Interpolation, Multiple Linear Regression, and image enlargement with Interpolation. It's made with Java Swing for the GUI and a lot of things needs to be overiden to make it looks good. This project gets the highest score in my college year.