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Re: simplifying a system of equations

• To: mathgroup at smc.vnet.net
• Subject: [mg106013] Re: [mg105983] simplifying a system of equations
• From: "Tony Harker" <a.harker at ucl.ac.uk>
• Date: Wed, 30 Dec 2009 04:14:39 -0500 (EST)
• References: <200912290618.BAA02648@smc.vnet.net>

You can ask for specified variables to be eliminated:

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

 gives the result you want.

   Tony Harker 

]-> -----Original Message-----
]-> From: Maria Davis [mailto:arbiadr at gmail.com] 
]-> Sent: 29 December 2009 06:19
]-> To: mathgroup at smc.vnet.net
]-> Subject: [mg105983] simplifying a system of equations
]-> 
]-> 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
]-> 
]-> 

• References:
  • simplifying a system of equations
    • From: Maria Davis <arbiadr@gmail.com>