I missed the lecture and was wondering if somebody could clue me in on the method. I as far as I can tell (and to prove that I am trying over here ) We introduce

x1=x(t) x2=x'(t) x3=x''(t)

and because my 2 equations contain dy/dx and d2y/dx2 terms I assume I have to introduce y1=y(t) y2=y'(t) y3=y''(t). But I dont understand where I go from here.

Silent