$$y'' +p(x)y' +q(x)y=0$$ Assuming $y_1$ and $y_2$ are two solutions of the given DE, find a first order constant coefficient DE satisfied by their Wronskian, and solve it.
I don't really understand how to approach this. The DE has to be constant-coefficient and first-order but how do I get it from this with just knowing that $y_1$ and $y_2$. I mean what does the second part have to do with the given equation?