Solving Equations with 3 variables and many parameters

• To: mathgroup at smc.vnet.net
• Subject: [mg132372] Solving Equations with 3 variables and many parameters
• From: drascher <rascher at usfca.edu>
• Date: Sun, 2 Mar 2014 01:04:52 -0500 (EST)
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• Delivered-to: l-mathgroup@wolfram.com
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```Hello,

I am able to get Mathematica to solve:

Solve[{P1=(a[1]+C*b[11]+b[12]*P2)/(2*b[11]), P2=(a[2]+C*b[22]+b[21]*P1)/(2*b[22])}, {P1, P2}]

but it won't solve the following (which is one more variable P3 and its equation):

Solve[{P1=(a[1]+C*b[11]+b[12]*P2+b[13]*P3)/(2*b[11]), P2=(a[2]+C*b[22]+b[21]*P1+b[23]*P3)/(2*b[22]), P3=(a[3]+C*b[33]+b[31]*P1+b[32]*P2)/(2*b[33])}, {P1, P2, P3}]

It says that it doesn't understand how to interpret the word "Solve" even though it does it for the first eqn.

Any help is appreciated.

```

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