How to use
Enter values for the coordinates
z1 (for the point P) and
z2 (for the point Q) into the
corresponding text input fields.
Click the "Graph" button
(this button also refreshes the graph).
To erase the graph and all input fields, click the
Include line segment
The point P and its coordinate box are drawn
The point Q and its coordinate box are drawn
The line segment between P and Q and the
vector from P to Q are drawn in