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Re: simplifying a system of equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106010] Re: simplifying a system of equations
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Wed, 30 Dec 2009 04:14:05 -0500 (EST)
  • References: <hhc76q$2mj$1@smc.vnet.net>

Hi Maria,

Mathematica's answer is correct, but you probably want y and z be
eliminated. You can do this as follows:

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

Cheers -- Sjoerd


On Dec 29, 8:22 am, Maria Davis <arbi... 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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