Education Technology

Exploring Domain and Range

Activity Overview

Explore visual representations of relations to determine their domain and range.


  • Students will identify the domain and range of a relation from the graph.
  • Students will write symbolic expressions to describe the domain and range of a function.
  • Students will recognize that different functions can have the same domain or the same range.


  • domain
  • range

About the Lesson

This lesson involves identifying a set of x-values in both symbols and words, identifying the set of x-values used in generating the function as the domain of the function, and identifying the set of y-values used in generating the function as the range of the function. As a result, students will:

  • Interpret graphs of functions to identify the domain and the range.
  • Describe sets of x-values and y-values in both symbols and words.