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NEWBIE: How do I use the results of a Solve?

• To: mathgroup at smc.vnet.net
• Subject: [mg95963] NEWBIE: How do I use the results of a Solve?
• From: Tim Heger <timheger at yahoo.com>
• Date: Sat, 31 Jan 2009 01:11:53 -0500 (EST)

I can't figure out how to use the results of Solve I just created  as a new
variable.

Here's a simple example of what I am trying to do:

Solve[some equation, x]

Results in {x->12}

I then want to use the x in  y =  x * 5 for example....

Obviously when I try to use this it fails because Mathematica sees the
equation as y = {x->12} * 5  and not y = 12 *5 ...

How do I change the results from the Solve from a rule to an actual value I
can then use?

Thanks,

Tim

• Follow-Ups:
  • Re: NEWBIE: How do I use the results of a Solve?
    • From: "Jaccard Florian" <Florian.Jaccard@he-arc.ch>