Re: Using Solve[] - What did I do wrong?

• To: mathgroup at smc.vnet.net
• Subject: [mg109320] Re: Using Solve[] - What did I do wrong?
• From: eric948470 <eric948470 at gmail.com>
• Date: Wed, 21 Apr 2010 07:48:04 -0400 (EDT)
• References: <hqmd3t\$pti\$1@smc.vnet.net>

```On Apr 21, 4:30 am, eric948470 <eric948... at gmail.com> wrote:
> Hi,
>
> If you look at the command below, you would probably be able to
> understand what I was trying to do. I have linear equations, and I
> want to solve for the variable g2, and I don't want the variables dx1,
> dx2, dy1 and dy2 in the answer. What I get for the output is {{}}.
> What did I do wrong?
>
> Solve[{phi2 + a2*dx1 + b2*dy1 + c2*dx2 + d2*dy2 == 0,
>   psi2 + A2*dx1 + B2*dy1 + c2*dx2 + D2*dy2 == 0, dx2 == -g2 - f=
2*dy2,
>   dx1 == -g1 - f1*dy1}, g2, {dx1, dx2, dy1, dy2}]

Oh, yeah. I was trying to solve for 5 variables with only 4 equations.
Sorry about that, LOL. I became aware of this only when I tried to
solve it by hand. But the book gave a solution though. I must have
missed an equation somewhere.

Thanks

```

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