solving equations simultaneously

[truculenity]

I cant seem to get this to work, any suggestions?
a:0
b:0
c:0

Given
76-60-b*3000-a*2000=0 (bouleian =)
80-c*4000-60-b*3000=0 (bouleian =)
c=a+b (bouleian =)

Find(a,b,c)=

then i get an error in the find that says the variable or function is not defined above...help

 

[GregLocock]

Not too sure what you mean by Boolean = , I think you have to use the x=y button.

try varying your initial guesses

try using minerr

The error message confuses me, I think the cause may be a typo somewhere rather than the above.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[IRstuff]

Not sure what you're doing wrong. It works in v11.

0.0260
-0.0120
0.0140

TTFN

Eng-Tips Policies FAQ731-376

 

[jghrist]

It works in v13 also.

 

[miecz]

Take a look at your text styles. Everything should be "variables" except the numbers, 76, 60, etc., which should be "constants".

 

[raduf]

I've run into the same problem with a different system of equations and I cannot get any results.
I've tried the system as above (mathcad V13) and got same message "Function not defined" or "This variable is undefined".
Any help?
I can e-mail my system of equations to whoever is interested in giving me a hand.
Thanks

 

[IRstuff]

Try posting your question and file on the Mathcad user forum:

http://collab.mathsoft.com/~Mathcad2000

Files are easier to deal with there

TTFN

Eng-Tips Policies FAQ731-376