Re: Form of a linear equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg53742] Re: Form of a linear equation*From*: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>*Date*: Wed, 26 Jan 2005 04:36:17 -0500 (EST)*Organization*: Uni Leipzig*References*: <ct56ja$ebg$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, eqn = -(4 + 4x + y) / 17^(1/2) == (2 + x + y) / 2^(1/2); eqn /. a_ == b_ :> Collect[ a - b, {x, y}] == 0 ?? Regards Jens "DJ Craig" <spit at djtricities.com> schrieb im Newsbeitrag news:ct56ja$ebg$1 at smc.vnet.net... > I'm trying to convert this linear equation: > > -(4+4x+y) / 17^(1/2) = (2+x+y) / 2^(1/2) > > into the form: > > (a_)*x + (b_)*y + (c_) = 0 > > This sounds simple enough, but I can't figure out how to make > Mathematica do it. My TI-89 does it automatically, but I need to be > able to do this like a batch process for a bunch of linear equations. > Heres the solution the TI-89 gives me: > > \!\(\* > StyleBox[\(\((\(\(-4\)\ \@17\)\/17 - \@2\/2)\)\ x + \((\(-\@17\)\/17 > - \ > \@2\/2)\)\ y - \(3\ \@17\)\/17 - \@2 = 0\), > FontWeight->"Bold"]\) > > Just copy and paste that mess into Mathematica and it will change into > the equation at the top, but in the form that I want it. > > I haven't been using Mathematica for long. I'm used to my TI-89; I've > been using it for years. >