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Function or Not. Function or Not. Input. Output. 1 2 3 4. 2 3 4. NO. NO. Yes. Yes. Function or Not. Input. Output. 1 2 3 4. 1 2 3 4. Yes. Yes. Yes. No. Function or Not. Input. Output. 1 2 3 4. 5 4 3 2. Yes. Yes. No. Yes. Function or Not. Input. Output.
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Function or Not Input Output 1 2 3 4 2 3 4 NO NO Yes Yes
Function or Not Input Output 1 2 3 4 1 2 3 4 Yes Yes Yes No
Function or Not Input Output 1 2 3 4 5 4 3 2 Yes Yes No Yes
Function or Not Input Output 5 4 3 2 Yes 1 No Yes No
Function or Not Input Output 1 2 3 4 No 2 Yes No Yes
Function or Not Input Output 2 4 6 8 1 2 3 4 Yes Yes Yes Yes
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=