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

*To*: mathgroup at smc.vnet.net*Subject*: [mg95989] Re: [mg95963] NEWBIE: How do I use the results of a Solve?*From*: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>*Date*: Sat, 31 Jan 2009 06:43:39 -0500 (EST)*References*: <200901310611.BAA28347@smc.vnet.net>

Like this : Solve[2*x + 9 == 33, x] /. Rule -> Set But it's not a good idea, because you will have to delete x later on, writing Clear[x]... I would suggest to use Rules like this : y == x*5 /. Solve[2*x + 9 == 33, x][[1]] and so no variable will be fixed with a value! Regards Jaccard Florian Rendez-vous le 21 mars 2009, lors de nos portes ouvertes. -----Message d'origine----- De : Tim Heger [mailto:timheger at yahoo.com] Envoy=E9 : samedi, 31. janvier 2009 07:12 =C0 : mathgroup at smc.vnet.net Objet : [mg95963] NEWBIE: How do I use the results of a Solve? 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

**References**:**NEWBIE: How do I use the results of a Solve?***From:*Tim Heger <timheger@yahoo.com>