$\{\begin{array}{ll}x\prime =& Ax+By\\ y\prime =& Cx+Dy\end{array}$

where $A,B,C,D$ are constant.
The difficulty of the exercise varies considerably
with the choices of several parameters.
Other exercises on:

Please take note that WIMS pages are interactively generated; they are not ordinary HTML files. They must be used interactively ONLINE. It is useless for you to gather them through a robot program.

- Description: recognize the phase graph of a given ODE. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games
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