Using ODEs in MATLAB

Hey guys,

I currently have a system of three ODEs tht model the orbit of a satellite around the earth

r2 = dr1 / dt

dr2/dt = r * (dtheta/dt)^2 - 10 * (dtheta/dt)

dtheta/dt = 1 / r^2

the initial conditions are:
r1(0) = 1
theta(0) = 0
dr1/dt (0) = 0

How do i construct a function for this in matlab?
Im really confused and need a response ASAP

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