# Graphic ODE phase graph --- Introduction ---

This module lets you choose the correct phase graph for a given ODE which is of the form
 x'(t) = Ax+By y'(t) = Cx+Dy
where A,B,C,D are constants.

The difficulty of the exercise varies considerably with the choices of several parameters.
• Level of difficulty: 1   2   3
• Number of presented phase graphs: 2   3   4   5   6   7   8
• Number of questions in each session: 1   2   3   4   5   6   7   8   9   10   (The score is attributed only at the end of a session.)
• or one can ask you to recognize each presented curve.

Other members in the series of graphical exercises.

In order to access WIMS services, you need a browser supporting forms. In order to test the browser you are using, please type the word wims here: and press Enter''.