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Re: Equation problem

• To: mathgroup at smc.vnet.net
• Subject: [mg109292] Re: Equation problem
• From: Bill Rowe <readnews at sbcglobal.net>
• Date: Tue, 20 Apr 2010 05:53:40 -0400 (EDT)

On 4/19/10 at 4:07 AM, imoric1 at gmail.com (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?

Yes. But first you will need to use the appropriate syntax. In
Mathematica, an equation has a double equal sign (==) not a
single equal sign. All built-in functions begin with an upper
case letter and function arguments are delimited with square
brackets. That is, your equation needs to be written as:

y == ((1 + Sqrt[5.71 10^8/x]) x)/6.38 10^9

or

y == ((1 + Sqrt[5.71*10^8/x])*x)/6.38*10^9

Then doing

Solve[y == ((1 + Sqrt[5.71 10^8/x]) x)/6.38 10^9, x]

will give you the desired solutions