calculator solving linear eqns in terms of unknown

10022016, 05:26 PM
Post: #1




calculator solving linear eqns in terms of unknown
My friends less expensive ti solves a 3x4 system of linear equations in terms of 4th unknown. How do i do this on my prime?
Example 2a+2b+2c=0 3a+b+2c=0 a+b+c=W I want to get all my variables in terms of W. The type of problem im solving is a statics problem and im asked to find the maximum weight of flowerpot if the chain can hold a max 50lb tension. So W represents the maximum weight (flowerpot) that the system can hold. How do i input this? 

10022016, 07:09 PM
Post: #2




RE: calculator solving linear eqns in terms of unknown
(10022016 05:26 PM)yland Wrote: 2a+2b+2c=0your 3rd and 1st equation says that W is useless in your system. (divide by 2 your first equationto see it) lets change your 3rd equation by : a+b+2c=W then you can use linsolve to get it : linsolve([2*a+2*b+2*c=0 3*a+b+2*c=0 a+b+2*c=w],[a b c]) it gives : [1/2*w, 1/2*w w] that's a,b and c in term of w. primer 

10022016, 07:25 PM
Post: #3




RE: calculator solving linear eqns in terms of unknown
Thank you primer. Appreciate the help


10022016, 08:51 PM
Post: #4




RE: calculator solving linear eqns in terms of unknown
Im getting error: bad argument value


10022016, 09:37 PM
Post: #5




RE: calculator solving linear eqns in terms of unknown
(10022016 08:51 PM)yland Wrote: Im getting error: bad argument value Try: linsolve([2*a+2*b+2*c=0,3*a+b+2*c=0,a+b+2*c=w],[a,b,c]) Mark Hardman Ceci n'est pas une signature. 

10032016, 04:09 PM
Post: #6




RE: calculator solving linear eqns in terms of unknown
(10022016 05:26 PM)yland Wrote: My friends less expensive ti solves a 3x4 system of linear equations in terms of 4th unknown. How do i do this on my prime? There is something about your system that does not sound right to me: 2*a+2*b+2*c=0 > (a+b+c)=0 then W=0. Could you please rewrite the exact equations ? Best, Aries ;) 

10032016, 05:11 PM
Post: #7




RE: calculator solving linear eqns in terms of unknown
thanks for the replies and help, those are not actual eqns I just wanted to give an idea of the form I was dealing with. I figured out why I was getting the error, I was not aware of the different ways to access linsolve command. Basicly I was using LinSolve. Now all is well thanks again.


10062016, 02:55 PM
Post: #8




RE: calculator solving linear eqns in terms of unknown
(10032016 05:11 PM)yland Wrote: thanks for the replies and help, those are not actual eqns I just wanted to give an idea of the form I was dealing with. I figured out why I was getting the error, I was not aware of the different ways to access linsolve command. Basicly I was using LinSolve. Now all is well thanks again. You're welcome, yland ;) Best, Aries :) 

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