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MathGroup Archive 2005

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Re: Graphing sets of linear inequalities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53961] Re: Graphing sets of linear inequalities
  • From: Helen Read <read at math.uvm.edu>
  • Date: Sat, 5 Feb 2005 03:15:39 -0500 (EST)
  • Organization: EM Computer Facility, The University of Vermont
  • References: <ctvfhb$19v$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

DJ Craig wrote:

> How do you graph something like this:
> -2 = x + 2y = 4
> I need the areas where this is true to be shaded, and solid lines at x
> + 2y = -2 and x + 2y = 4.

Assuming you mean -2 <= x+2y <= 4, try this.

<< Graphics`InequalityGraphics`

InequalityPlot[-2 <= x + 2y <= 4, {x, -5, 5}, {y, -5, 5}]

--
Helen Read
University of Vermont


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