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MathGroup Archive 1998

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Re: Need help for a simple equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg12856] Re: [mg12813] Need help for a simple equation
  • From: Hugh Walker <hwalker at gvtc.com>
  • Date: Wed, 17 Jun 1998 00:27:59 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Tae-Wan Kim <tae-wan.kim at sdrc.com> writes

>My problem is as follows:

>f(x, y) = a x^2 + b xy + c y^2 + d x + e y + f = 0     (1)

>partial derivative of f(x,y) with respect to x:

>dfx(x, y) = 2 a x + b y + d = 0      (2)

>I'd like to solve (1) and (2) using Mathematica.
********************

Hello Tae-wan:

Q = a x^2 + b x y + c y^2 + d x + e y + f; eq = {Q==0, D[Q,x]==0};
Solve[eq,{x,y}]

Cheers!

Hugh Walker
Professsor Emeritus
University of Houston

Gnarly Oaks



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