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Function or Not

Learn how to determine if a given relation is a function based on graphs, tables, mapping diagrams, and equations. Understand key concepts such as the vertical line test, no repeats in input values, unique outputs, and the format of equations.

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Function or Not

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  1. Function or Not

  2. Function or Not Input Output 1 2 3 4 2 3 4 NO NO Yes Yes

  3. Function or Not Input Output 1 2 3 4 1 2 3 4 Yes Yes Yes No

  4. Function or Not Input Output 1 2 3 4 5 4 3 2 Yes Yes No Yes

  5. Function or Not Input Output 5 4 3 2 Yes 1 No Yes No

  6. Function or Not Input Output 1 2 3 4 No 2 Yes No Yes

  7. Function or Not Input Output 2 4 6 8 1 2 3 4 Yes Yes Yes Yes

  8. Determining Functionality • From a graph • Must pass the vertical line test (not touch in more than one place at same time) • From a table • No repeats in “X” values • From a mapping diagram • Only one arrow can come out of any one input (for ever input there is only one output) • From and equation • Is the equation written in Y=

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