Straight line in the plane defined by two points, one point and a direction vector, or a cartesian equation.

- Shortcut: Ctrl+D
- We give a name.
- We give a command like:
- [A,B] for a line passing through the point’s affixes A and B.
- [A,A+v] for a line passing through the point A and directed by the vector v.(A and v are complex numbers).
- [a,b,c] for a line whose cartesian equation is ax+by=c.

- It is possible to deterrmine the intersection of two lines with Inter operator. For example, if A,B,C,D are four point’s affixes, then executing [A,B] Inter [C,D] will give the affix of the intersection point of (AB) and (CD) if they are secants, Nil if not.
- Corresponding graphical command:Droite (to be used in a User-defined type element).