Matrice: Gauss-Jordan is a free Android application developed by HENRY X. It offers two main functions for solving equations and calculating polynomial equations. The first function allows the user to solve equations with "n" unknowns using the Gauss-Jordan or "Gaussian elimination" method. The feature takes into account decimal or integer numbers and fractions. The results are displayed as fractions and then in decimal form. The system can solve equations with up to 3 unknowns and provides a step-by-step explanation of the resolution. Users can save the result as an image. The second function enables the user to calculate the corresponding polynomial equation from the given points. The application displays the result with a corresponding graph, taking into account decimal or integer numbers and fractions. Additionally, Matrice: Gauss-Jordan provides two bonus features for simplifying a fraction and decomposing an integer. Overall, Matrice: Gauss-Jordan is a useful application for students and professionals alike.