Re: Form of a linear equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg53741] Re: [mg53734] Form of a linear equation*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Wed, 26 Jan 2005 04:36:15 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

eqn=-(4+4x+y)/17^(1/2)\[Equal](2+x+y)/2^(1/2); eqn /. (lhs_==rhs_):>(Collect[lhs-rhs,{x,y}]==0) (-(1/Sqrt[2]) - 4/Sqrt[17])*x + (-(1/Sqrt[2]) - 1/Sqrt[17])*y - 4/Sqrt[17] - Sqrt[2] == 0 eqn /. (lhs_==rhs_):>(Collect[lhs-rhs,{x,y},Together]==0) (1/34)*(-17*Sqrt[2] - 8*Sqrt[17])*x + (1/34)*(-17*Sqrt[2] - 2*Sqrt[17])*y + (1/17)*(-17*Sqrt[2] - 4*Sqrt[17]) == 0 Bob Hanlon > > From: "DJ Craig" <spit at djtricities.com> To: mathgroup at smc.vnet.net > Date: 2005/01/25 Tue AM 05:03:48 EST > To: mathgroup at smc.vnet.net > Subject: [mg53741] [mg53734] Form of a linear equation > > 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. > >