Missouri Learning Standards
8.F.A. Define, evaluate and compare functions.
8.F.A.1. Explore the concept of functions. (The use of function notation is not required.)
8.F.A.1a. Understand that a function assigns to each input exactly one output.
8.F.A.1b. Determine if a relation is a function.
8.F.B. Use functions to model relationships between quantities.
8.F.B.5. Describe the functional relationship between two quantities from a graph or a verbal description.