Lesson Plan: Injective Functions Mathematics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to determine whether a function is a one-to-one function (injective).


Students will be able to

  • understand the definition of an injective function (one-to-one),
  • identify whether a function, given algebraically, is injective,
  • use the horizontal line test to determine whether any function, given graphically, is injective.


Students should already be familiar with

  • graphs of functions.


Students will not cover

  • definitions for surjective and bijective functions.

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