Equation editor/solver

[betlista]

Hi,

is someone of you using some equation editor SW (free) and can recommend some?

The perfect one should know to extract variable/solve equation/system of equations. Just good one can help with modifications.

Example:

V_x + a * v_x = X_x + b * v’_x

V_y + a * v_y = X_y + b * v’_y

I’d like something, that helps me to derive formula for a

a = (X_x + b * v’_x - V_x) / v_x

and additionaly use (substitute) that in second equation to find formula for b…

If you recommend something, would be good to add some instructions how to achieve that

[compmath]

I like Sage, http://www.sagemath.org/ which can solve system of equations. There is one example of solving a system of equations on http://www.sagemath.org/doc/tutorial/tour_algebra.html . If you need a program to write equations in beautiful format, I use LaTeX.

[bangga]

Terima kasih dan salam kenal.
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