How to solve 2 ODEs by using ODE 45

I know how to use ode45 to solve 1 ode, but now I have 2, I don't know what to do. Should I do it on one ode45 function or I should separate them?

Answer 1

If you have a Higher Order ODE then you may have to break that down into several 1st order ODEs as shown here:

http://www.mathworks.com/help/matlab/math/ordinary-differential-equations.html#brfg9jq-1

Scroll down for some specific examples on how this is done.