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Mar 25, 2016 at 18:48 comment added MathX oh yes you are right. And in that case it is equal to a from the OP.
Mar 25, 2016 at 18:41 history edited Michael Seifert CC BY-SA 3.0
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Mar 25, 2016 at 18:40 comment added Michael Seifert $c_3$ can be determined from the initial conditions: since it's a constant, then $c_3 = x(0) + y(0)$. I've edited to clarify this. In general, you'll have two constants of integration for this system; in my solution, they'll be the $c_3$ I coded in and the C[1] generated by Mathematica in the solution.
Mar 25, 2016 at 18:39 comment added MathX Wait, but now don't we have an unknown c3 in our solution? Meaning, x[t] is now expressed in terms of a y[t] that we still don't know what it is.
Mar 25, 2016 at 17:34 history answered Michael Seifert CC BY-SA 3.0