All the equations are color-coded, so it is easy to distinguish ... One of the most interactive features I found in the graphing calculator was the real-time analysis of a multivariable relation.

But, as is with all good things, its tenure came to an end when it was recently replaced by a secondhand TI-84 color graphing calculator, a 2014 model no less. Product on Amazon: Texas Instruments ...

[Pierre Parent] and [Ael Gain] have certainly taken these values to heart with their open handheld graphing calculator. While the duo isn’t giving away the calculators themselves, they are ...