This app is a free math calculator which is able to solve systems of linear equations. You can solve: -Systems of two variables and two equations -Systems of three variables and two equations -Systems of three variables and three equations -Systems of four variables and two equations -Systems of four variables and three equations -Systems of four variables and four equations -Systems of four variables and four equations -Systems with n variables and m equations (more than 4) Best mathematical tool for school and college! If you are a student, it will help you to learn linear algebra! Note: Linear equation systems play an important role in engineering, physics, chemistry, computer science, and economics.