Solving with the built-in equations of the 35s « Next Oldest | Next Newest »

 ▼ Palmer O. Hanson, Jr. Unregistered Posts: 901 Threads: 113 Joined: Jun 2007 10-15-2012, 09:25 PM Page 7-6 of the 35s manual describes use of the built-in equations from the keyboard. I would like to use the "2x2 lin solve" equation in a program. How do I do that? ▼ Gene Wright Unregistered Posts: 1,545 Threads: 168 Joined: Jul 2005 10-16-2012, 08:05 AM This should show how. Good to finally meet you a few weeks ago in Nashville! ▼ Gene Wright Unregistered Posts: 1,545 Threads: 168 Joined: Jul 2005 10-16-2012, 09:24 PM Ah, I mis-read your original question. You cannot use one of the built-in equations in a user program. Sorry! Andrew Feist Unregistered Posts: 18 Threads: 0 Joined: Aug 2012 10-16-2012, 09:02 PM I don't think you do--I think you can only type your own equations into a program, not use the ones that are built in. ▼ Dieter Unregistered Posts: 653 Threads: 26 Joined: Aug 2010 10-17-2012, 03:17 PM You cannot use equations from the 35s equation list in your own programs. But solving a 2x2 system is so trivial that it can be done in a very short user routine: ```RCL A RCL* F RCL D RCL* C - RCL A RCL* E RCL B RCL* D - / ENTER RCL* B +/- RCL+ C RCL/ A ``` This returns the two unknowns in X and Y. Actually you can also do this in just two lines, using the EQN-feature: ```([A,D]*[F,-C])/([A,B]*[E,-D]>G) ([C,B]*[E,-F])/G ``` Type "STO G" to enter ">G". Please also note that the minuses are unary (signs, not operators). This solution also works for A=0. ;-) Dieter Edited: 17 Oct 2012, 3:28 p.m.

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