GeoGebra
International Geo Gebra Institute: Geo Gebra
The free mathematics software creates interactive learning material that combines geometry, graphing, tables, algebra, statistics, and calculus. Teachers can download the free open source software to enhance their mathematics lessons. A...
Khan Academy
Khan Academy: Practice: Slope From Two Points
In this practice quiz, students are asked to calculate the slope of a line that passes through two given coordinate pairs. Includes hints.