AW: 7 equations and 7 unknowns (non-linear equations)

*To*: mathgroup at smc.vnet.net*Subject*: [mg49459] AW: [mg49448] 7 equations and 7 unknowns (non-linear equations)*From*: Matthias.Bode at oppenheim.de*Date*: Wed, 21 Jul 2004 06:39:19 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hello Arthur, there are several paths, each of them specific: 1. Solve[] for analytically solvable systems of equations. 2. FindRoot[] for systems of equations that have to be solved numerically. Without knowing anything about your equations it's difficult to be more precise. Best regards, Matthias Bode Sal. Oppenheim jr. & Cie. KGaA Untermainanlage 1 D-60329 Frankfurt am Main GERMANY Tel.: +49(0)69 71 34 53 80 Mobile: +49(0)172 6 74 95 77 Fax: +49(0)69 71 34 95 380 E-mail: matthias.bode at oppenheim.de Internet: http://www.oppenheim.de -----Ursprüngliche Nachricht----- Von: manushidsl at ameritech.net [mailto:manushidsl at ameritech.net] Gesendet: Dienstag, 20. Juli 2004 13:54 An: mathgroup at smc.vnet.net Betreff: [mg49448] 7 equations and 7 unknowns (non-linear equations) Hi, I'm trying to solve for an exit temprature in a forced air heat exchanger and I have a total of 7 equations and also 7 unknowns. I'm not sure how to go about it by using mathematica to solve these equatins. So far I have typed in the equations on a new mathematica document and have also declared some of the known varialbes. After I'm done typing them in I press Shift + Enter and the results that come out are very confusing (I do no think it is giving me a proper answer). Is there a specific path that I must follow to selve for these equations? thanx, Arthur