Hello, from your question it isn't clear whether you want to solve the equations analytically (DSolve) or numerically (NDSolve). If you look into the help pages for DSolve, then the first "neat example" shows a system of 2 equations. Of course also the second heading of DSolve shows the necessary calling syntax.
Good luck Alois
-- Alois Steindl, Tel.: +43 (1) 58801 / 32558 Inst. for Mechanics and Mechatronics Fax.: +43 (1) 58801 / 32598 Vienna University of Technology, A-1040 Wiedner Hauptstr. 8-10