Is there an equivalent to Maple "eliminate" functi

[pt]

Hi,

is there some rough equivalent to Maple's "eliminate" function available on the TI-89, which eliminates some variables from a set of equations?

Regards,

Peter

[mellamokb]

Hi pt,

It appears that the eliminate function in Maple is similar to the solve( function in TI-89. You can solve any combination of equations by joining the equations and then using a variable or list of variables to solve for.

Example (from http://www.math.tamu.edu/~sottile/conferences/Summer_IMA07/maple_tutorial/introduction-maple/node4.html):
# intersecting hyperboloid and sphere
hyp := x^2+(y-3/2)^2-z^2-1/4;
sph := x^2+y^2+z^2-4;
eliminate( {hyp, sph}, x);
# [{x = RootOf(_Z^2+y^2+z^2-4)}, {-6+3*y+2*z^2}]

The same would be accomplished with the following code in the TI-89:
x^2+(y-3/2)^2-z^2-1/4 -> hyp
x^2+y^2+z^2-4 -> sph
solve(hyp=sph,x)

Which gives the output: 0=3y+2z^2-6.

Note that the Ti-89 being a handheld device with limited resources is not nearly as powerful as computer symbolic manipulation software, so it may not be able to completely solve more complex equations.

Hope this helps!

Regards,
~ mellamokb