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MathGroup Archive 1996

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Re: A Questions Involving Solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg3953] Re: [mg3878] A Questions Involving Solve
  • From: Robert Pratt <rpratt at math.unc.edu>
  • Date: Sat, 11 May 1996 23:52:36 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

You don't have to break up the process into two steps.  Solve will accept 
more than one equation at a time.

Solve[{11 x - x^2 - 3 y == 0, -5 y + 4 x y == 0}, {x, y}]

returns the three ordered pairs {x, y} that work: {0, 0}, {11, 0}, and 
{5/4, 65/16}.

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill
CB# 3250, 331 Phillips Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu

On Sat, 4 May 1996, Michael R. Lewis wrote:

> I have a quick question for anyone. I need to solve some equations here is an 
> example of what I need to solve:
> 
> A=Solve[11x-x^2-3y==0,x]
> B=Solve[-5y+4xy==0,x]
> 
> This give me {{x->whatever},{x->whatever}} for each equation. I then need to 
> set the equations equal to each other and find the ordered pair (x,y) that 
> satifies A=B. In other words I need to set the solutions of the above 
> equations (11x-x^2-3y==0 and -5y+4xy==0) and get the ordered pair that 
> satifies this new equation. I'm having trouble doing this. If anyone can help 
> it would be greatly appreciated.
> 
> Please respond to the newsgroup or better yet to me personally 
> (milewis at bu.edu).
> 
> Thanks in advance,
> 
> Mike Lewis
> 
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