Identifying FUNctions

What is the definition of function?

• Has inputs and outputs
• Every input has only ONE output
• Inputs have different outputs every time
• x-values and y-values

Which of the following is a function?

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• 
• 
• 

Is this is a function or not a function?

• Function
• Not a Function

Is this a function or not a function?

• Function
• Not a Function

Is this graph a function or not a function? 

• Function
• Not a Function

Is the relation a function? Why.

• Yes, because the x-value 11 has two y-values pair with it.
• Yes, because each x-value has only one y-value paired with it.
• No, because the x-value 11 has two y-values pair with it.
• No, because each x-value has only one y-value paired with it.

Which graph is NOT a function?

• Graph 1
• Graph 2
• Graph 3
• Graph 4

Which graph is a function?

• Graph 1
• Graph 2
• Graph 3
• Graph 4

Which set of ordered pairs is a function?

• {(9,5), (10,5), (9,-5), (10,-5)}

• {(3,4), (4,-3), (7,4), (3, 8)}

• {(6,-5), (7, -3), (8, -1), (9, 1)}

• {(2, -2), (5, 9), (5, -7), (1, 4)}

• Function
• Not a Function