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Re: simplifying a system of equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106000] Re: [mg105983] simplifying a system of equations
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Wed, 30 Dec 2009 04:12:12 -0500 (EST)
  • Reply-to: hanlonr at cox.net

Specify that you want y and z eliminated

Solve[x == y + z && y == e + r && z == t + u, {x}, {y, z}]

{{x->e+r+t+u}}


Bob Hanlon

---- Maria Davis <arbiadr at gmail.com> wrote: 

=============
Hi!

I have a system of equations, that I want to solve symbolically and
not numerically how can I do this?
example: suppose I have the following system of equations:
x=y+z
y=e+r
z=t+u
I want to obtain x=e+r+t+u as a result.
I have tried the command
Solve[x == y + z && y == e + r && z == t + u, {x}]
 but Solve returns :x=y+z

Can you please help me?
Thank you in advance




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