After fixing the typo (e1 -> eq2), my system (Maxima 5.9.3 GCL 2.6.7 Windows
XP) also ran out of storage (not during display, during calculation).
On the other hand, if you take each of the coefficients and make them into
a
variable (e.g. x1*y1 -> x1y1, x1^2 -> x12), it comes back very quickly,
though the answer is of course large. Presumably you can subst back in, but
I haven't tried. I don't know why solve is having such a problem with the
original coefficients.
-s