Interactive
GeoGebra

International Geo Gebra Institute: Geo Gebra

For Students 9th - 10th
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...
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Khan Academy

Khan Academy: Practice: Slope From Two Points

For Students 8th
In this practice quiz, students are asked to calculate the slope of a line that passes through two given coordinate pairs. Includes hints.