Functions

Overview

Goal. Tell whether a relation is a function, and state the domain and range of a relation given as ordered pairs, a table, or a graph.

Function (definition). A relation in which each input has exactly one output.

Relations, the function rule, domain and range, the vertical line test.

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Watch the lesson video.

Goal. Decide whether a relation is a function, and read off its domain and range from ordered pairs, tables, and graphs.

Function (definition). A relation in which each input has exactly one output.