Sal explains why a vertical line *doesn't* represent a function.
Recognizing functions from graphs is a free educational video by Khan Academy.It helps students in grades 8 practice the following standards 8.F.A.1.
1. 8.F.A.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. (Function notation is not required in Grade 8.).
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