Function or not a function

Is this mapping a function and how can you tell?

• Yes its a function cause all the numbers have lines
• No it's not a function because there a 5 in both ovals
• No it's not a function because the x value 5 has y values of  2 & 9
• No it's not a function because the y value 5 has x values of  2 & 9

Is this table a function and how can you tell?

• Yes its a function because there are not variables for missing numbers
• No it's not a function because the y value 4 repeated
• No it isn't a function because the x value 2 is repeated
• No it's not a function because the x value 5 has y values of  10 & 12

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

Is the following relation a function?
{(1,5), (1,7), (3,9), (4,11)}

• Yes
• No

Does this mapping diagram represent a function?

• No, because there are repeating input values
• Yes, because there are no repeating input values

• Function
• Not a Function

Is this mapping a function or not a function? 

• Function
• Not a Function