Possible bug found: linsolve() does not work with x squared or y squared.

[mpowell]

If I impute onto my Ti-nSpire
linSolve({x2+y2=0,x2+y2=-1),{x,y}) "The 2 represents a letter
squared"

I get the following error: "Error: Variable is not defined".
Is there a way to fix it? A

[Andy Kemp]

You can't solve those equations with linsolve as it only solves
'linear equations' and x^2 etc are not linear...

Sent from my iPhone

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[mpowell]

Cool, thanks. At first, I thought that it was a bug was the reason I
asked.

On Sep 4, 1:22 am, Andy Kemp <a...@kemp.co> wrote:
> You can't solve those equations with linsolve as it only solves
> 'linear equations' and x^2 etc are not linear...
>
> Sent from my iPhone
>

[Andy Kemp]

If you have the CAS handheld you can solve this type of system by just
using the Solve command. But these types of non-linear systems cannot
be solved on the non-CAS algebraically...

You can however solve it graphically (with some effort) by rewriting
the equations in the form f1(x)=... (don't forget the +/- when you
square-root) then finding the intersections...

[mpowell]

Cool, thanks - just checking.. Is there a function on the ti-nspire
that will let me solve it

On Sep 4, 1:22 am, Andy Kemp <a...@kemp.co> wrote:

> You can't solve those equations with linsolve as it only solves
> 'linear equations' and x^2 etc are not linear...
>
> Sent from my iPhone
>

[Nelson Sousa]

No. You can use the built in solver to get the roots of a polynomial,
but not a system of non linear equations. For systems of non linear
eqs tou need ti-nspire cas.

Nelson