Functions or Not a Function and Direct Variation

• Function
• Not a Function

Is this graph a function or not a function? 

• Function

• Not a Function

Is this graph a function or not a function? 

• Function

• Not a Function

Is this graph a function or not a function? 

• Function 

• Not a Function 

Is this graph a function or not a function? 

• Function

• Not a Function 

Does this mapping diagram represent a function?

• No, because there are repeating input values

• Yes, because there are no repeating input values

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.

• Function
• Not a Function

• Function
• Not a Function

Is this mapping a function or not a function? 

• Function

• Not a Function