LESSON PURPOSE:Enrich students' understanding of two-dimensional x-y equations in a discovery-based or exploration-based activity.Have students analyze linear, quadratic, cubic, absolute value, sine, tangent, and random number functions and equations.Introduce sonifications of equations (hearable equations) as an alternative or supplement to visualizations of equations on traditional x-y graphs. It relies on the free Chordinates! web app online, by Pios Labs: https://www.pioslabs.com/chordinate