Geogebra file for demonstrating horizontal line tests for injectivity and surjectivity in functions. To use file, you need to download free software here: https://www.geogebra.org/
Strand: 5. Functions
Strand unit: 1. Functions
Suggestions for use: Use to show students how to test for injective and surjective functions graphically. Need free Geogebra software https://www.geogebra.org/
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