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Re: Solving multiple equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125529] Re: Solving multiple equations
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sun, 18 Mar 2012 02:38:18 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201203170752.CAA05141@smc.vnet.net>

eq1 = {0.15, 0.85, X1} == {X3, X2 + X4, X5};

eq2 = {X1 == 9/5, X4/(X3 + X4 + X5) == 1/3};

sol = Solve[Join[Thread[eq1], eq2]][[1]]

{X1 -> 1.8, X3 -> 0.15, X2 -> -0.125, X4 -> 0.975, X5 -> 1.8}


Bob Hanlon

On Sat, Mar 17, 2012 at 3:52 AM, Themis Matsoukas <tmatsoukas at me.com> wrote:
> I have two set of equations, one in the form,
>
> eq1 = ({0.15, 0.85, X1} == {X3, X2 + X4, X5})
>
> and the other in the form
>
> eq2={1. X1 == 9/5, X4/(X3 + X4 + X5)==1/3}
>
> Solve understands both Solve[eq1] and Solve[eq2] but if I want to solve the two sets simultaneously, what is the best way to combine eq1 and eq2 into a single list of equations, either of the form of eq1 or of eq2, that Solve can understand?
>
> Themis
>



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