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Re: Simple algebra problem

• To: mathgroup@smc.vnet.net
• Subject: [mg10318] Re: [mg10298] Simple algebra problem
• From: seanross@worldnet.att.net
• Date: Mon, 5 Jan 1998 22:24:33 -0500
• References: <199801050847.DAA01961@smc.vnet.net.>

Eddy Wibowo wrote:
> 
> Hi all netters,
> 
> Suppose that I have an equation of:
>         Sqrt[x+y]+ 2x + 3y == 0
> 
> Now, what is the Mathematica-way to find:
>         Sqrt[x+y] = ???
>         y = ???
> 
> Thanks very much beforehand...
> 
> -Edwin


To solve for a symbol in the equation, such as y, use Solve:

Solve[Sqrt[x+y]+2  x +3  y==0,y]

Solving for a function or something more complicated requires the use of
a transormation afterwards

Solve[aa+2  x +3  y==0,aa]/.aa->Sqrt[x+y] -- 
Remove the _nospam_ in the return address to respond.

• References:
  • Simple algebra problem
    • From: Eddy Wibowo <ew4516@bristol.ac.uk>