Module 1: Function Transformations

 

Lesson 2 Summary

 

A reflection is a transformation that creates a mirror image of the original. A reflection in the x-axis changes all y-coordinates to –y. A reflection in the y-axis changes all x-coordinates to –x. A point that does not change during a transformation is called an invariant.

 

This diagram shows a function labelled “Original,” its reflection across the y-axis labelled “y-axis reflection,” and its reflection across the x-axis labelled “x-axis reflection.”

 

Now is a good time to update your summary table for the reflections you learned in this lesson.


In the next section you will begin to look at stretching a function.