Understand that a function is a rule that assigns to each input exactly one output

Start lessonBegins with What is a function · Slides

Teacher tools for this standard

Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework

Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
Guided Notes →One page your students fill in and keep.
Exit Ticket →Three items at the end of class. No student accounts.
Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
Homework →Assign practice; it grades itself.

8.F.A.1

**8.F.A.1**: Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output. (Function notation is not required in Grade 8.)

8.F.A.1: Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output. (Function notation is not required in Grade 8.)

What you'll learn

Define a function as a rule that assigns to each input exactly one output
Determine whether a given relationship (table, set of ordered pairs, graph, or verbal description) is a function or not a function
Represent a function as a set of ordered pairs and plot those pairs on a coordinate plane
Apply the vertical line test to determine whether a graph represents a function
Explain in their own words why a relationship that assigns two different outputs to the same input is not a function

Review first:

Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line

Slides

Step through the lesson, or watch it as a narrated video

What is a function

✓ Start here

Watch as video

Practice

Try it on your own

Exercise

Practice problems, checked as you go

Was this lesson helpful?

Report a problem with this page