#solve the second equation to find y2 in terms of y1 and x
k2 = desolve(diff(y2,x,1)  == y1, dvar = y2) # i have used k2 to denote it
#use k2 to solve for y1
desolve(diff(y1,x,1)==k2, dvar=y1)

SageDays/Kreyszig-3.3-1 (last edited 2010-08-11 12:34:50 by Abhi-akash)