8.F.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.1

Internet Resources (Videos, Websites, etc.)


  1. Relations and Determining Whether a Relation is a Function (Video)

Grade A Math Help

  1. Determining Functions (Worksheet)

Khan Academy

Learn Zillion

  1. Identify function properties
  2. Identify a function from a graph
  3. Identify a function


  1. Distance-Time Graphs


  1. Linear Models

Online Practice from IXL

  1. Linear functions: Complete a function table (Eighth grade – V.3)
  2. Linear functions: Find points on a function graph (Eighth grade – V.5)
  3. Linear functions: Graph a line from a function table (Eighth grade – V.6)


  1. Function Flyer
  2. Graphit
  3. Slope Slider
  4. Graphs and Functions

Teach Engineering

  1. More Complicated Functions: Introduction to Linear Functions
  2. Coordinates and the Cartesian Plane

Texas Instruments

Math Nspired: Definition of Functions
This lesson involves examining relationships and functions and their inputs, outputs, domains, and ranges.
Math Nspired: Domain and Range
Explore visual representations of relations to determine their domain and range. Device: TI-Nspire(TM) CAS, TI-Nspire(TM)
Math Nspired: Function Notation
Investigate and understand the symbolic language in the notation of functions used in mathematics. Device: TI-Nspire(TM) CAS, TI-Nspire(TM)
Math Nspired: Function or Not a Function
Examine some input-output relations to determine if a relation is a function. Device: TI-Nspire(TM) CAS, TI-Nspire(TM)
Math Nspired: Growing Patterns
This lesson involves using pattern growth to construct functions.
Math Nspired: Real Graphs
This lesson involves identifying patterns of data from given lists.
Math Nspired: Toying with a Walk
This lesson involves collecting time data as a walker moves at a constant pace.
Math Nspired: Verbal to Visual: Sketching Graphs
This lesson involves sketching graphs based upon important features described verbally in a situation.
Math Nspired: What’s in a Line?
This lesson involves identifying linear functions.


  1. Introduction to Functions (Video)
  2. Introduction to Functions – Part 1 (Video)


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