In this lesson, students practice using function notation by relating it to their previous understanding of graphs. In the associated Algebra 1 lesson, students go into more depth interpreting function notation in situations. Students are supported by focusing mostly on coordinate points in this lesson so that a deeper understanding of the situation can be achieved in the Algebra 1 lesson.

Students construct viable arguments and critique the reasoning of others when they create functions and determine if a graph represents a function (MP3). Attending to precision (MP6) is also important when interpreting function notation as points on a graph.