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what is my error?

• To: mathgroup at smc.vnet.net
• Subject: [mg100438] what is my error?
• From: Richard Palmer <rhpalmer at gmail.com>
• Date: Thu, 4 Jun 2009 03:31:28 -0400 (EDT)

eqns = {mr + mp == 13, fr + fp == 19, mr + fr == 15, mp + fp == 17}NSolve[eqns,
{mr, mp, fr, fp}]

gives {{mr->-4.+1. fp,mp->17.-1. fp,fr->19.-1. fp}}

The solution is  {mr->8, mp->5, fr->7, fp->12} if mr,mp,fr,fp are greater
than zero

-- 
Richard Palmer

• Follow-Ups:
  • Re: what is my error?
    • From: Richard Palmer <rhpalmer@gmail.com>
  • Re: what is my error?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: what is my error?
    • From: Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>