This is an introduction to determining whether a relation is a function. The lesson plan defines both relations and functions and explains that a relation can be a function if the output values have only one distinct input value. The Vertical-Line Test is also explained for relations on the coordinate plane.
This lesson includes a warm-up, minilesson with guided steps through the process, examples, performance task, class activities and a worksheet for homework. Answer keys included.
Common Core Standards included on cover page for Grade 8 and High School Functions.
Both pdf and Word versions are included in the zip folder.