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simultaneous equations

• To: Mathgroup at yoda.physics.unc.edu
• Subject: simultaneous equations
• From: nikhil at enuxha.eas.asu.edu (Venkatesh Nikhil)
• Date: Mon, 27 Jul 92 12:44:26 -0700

mathgroup,
	  I need your help on the following problem.I have 8 equations as
follows:
a=P*mcp*ac*tc*tf*tr
b=P*mcp*(4*ac*tc*tf+ac*tc*tr+2*af*tc*tr-ac*tf*tr+ac*l*tc*tf*tr)
c=P*mcp*(4*ac*tc+4*af*tc+l*4*ac*tc*tf+l*ac*tc*tr+2*l*af*tc*tr-l*ac*tf*tr)
d=.....
"
"
"
h=..............

I need to solve these equations simultaneously for "ac" in terms of a,b,c,d,
e,f,g & h. So, here i need to eliminate the other variables like P, mcp, tc,
tf, tr, l, L, af, etc. 
I am using mathematica and tried the commands eliminate (but my PC ran out
of memory before giving me the solution) and Solve[eq,var,elim] ( but this one
did not work too).
Have any of you encountered a similar problem? Is there a way to obtain "ac" in
terms of just a, b, c, d, e, f, g&h eliminating the rest. I would appreciate
your suggestions. Is there any other software package i could use for this
problem?
Here is thanking you in advance.
 								Sincerely,
								Nikhil...