8th Grade · Functions
Relation
8.F.A.1
Definition
Any set of ordered pairs linking inputs to outputs. A function is a relation in which each input has exactly one output.
Examples
- {(1,2),(2,4),(3,6)} is a relation.
- Every function is a relation, but not every relation is a function.
Key rule
A relation becomes a function only when each input has exactly one output.
Memory hook
Any pairing of inputs and outputs.