Pamela J. Wells, Understanding Linear Functions and Their Representations, Mathematics Teaching in the Middle School, Vol. 21, No. 5 (December 2015/January 2016), pp. 308-316 ...

A month later, my understanding of trigonometric functions likewise deepened as I took over the class to learn to teach students using those same graphing calculators.

Unlike a linear, graph, a quadratic graph has an equation which includes an x squared term.

Graphing calculators have more advanced capabilities for higher-level math than scientific calculators, with larger, more dynamic screens for graphing functions and plotting coordinates.