Drawing system for linear equations and Linear Programming problems. It is a complete drawing system with its own command language. To give a simple example you can draw the line 2x + 3y = 6 by giving the command li 2,3,6, and the line will be displayed on the coordinate system. The program has the options of entering the input from the keyboard or from a file. The system is not actually limited to drawing lines, but that is what Prof. Salmi uses when teaching budgeting with linear programming in a classroom with an overhead projector to display the computer images of the relevant tasks (examples are included in the package).