Line Integral is a simple mathematic utility, totally free and which is run in the MSDOS setting, that lets you represent different types of graphic functions
The graphic functions that Line Integral lets you represent are of the type y=f(x), x=g(y) and polar equations of the type r=r(t), where t is the angle, and also parametric equations of the type x=x(t) or y=y(t).
Up to a total of nine equations can be represented. Line Integral also calcuates the integers on curves. Although it runs in MSDOS, you can also use the mouse to access the distinct parts of the program.