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).
>
>
> Mike Lewis
>
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```

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