LinSys is a small mathematical utility, totally free and does not even require installation, which has been designed to be run under MSDOS environment.
The purpose of LinSys is to solve equations of linear systems. You simply have to pass the parameters and variables of each equation and it will calculate the corresponding result. At most, it allows you to process 20 equations, and even supports working with rational numbers.
On the website of the author of LinSys you will find abundant information on how to use the program and on what is the correct way to pass the variables and parameters to each equation.
You can free download LinSys 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.