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Re: Equation problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109164] Re: Equation problem
  • From: DC <b.gatessucks at gmail.com>
  • Date: Wed, 14 Apr 2010 23:12:52 -0400 (EDT)
  • References: <hq39ug$na6$1@smc.vnet.net>

If I understand your equation correctly then x is not a linear function 
of y :

In[2]:= Solve[y == (1 + Sqrt[a/x]) x/b, x]

Out[2]= {{x -> 1/2 (a + 2 b y - Sqrt[a] Sqrt[a + 4 b y])}, {x ->
    1/2 (a + 2 b y + Sqrt[a] Sqrt[a + 4 b y])}}

-Francesco

On 04/14/2010 03:40 AM, Asttro wrote:
> I just started using Mathematica and have no idea how to do the following...
>
> I have the starting equation:
>
> y=((1+sqrt(5.71e8/x))*x)/6.38e9
>
> What I want is to obtain x=a+b*y, where a and b are parameters.
>
> Is this possible in Mathematica?
>


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