Functions vs Non-Functions

A function is a relationship between x and y values where the x-value is paired with ​ (a)   y-value.

• only one

• two

• more than one

• many

Define this graph. Does it pass the vertical line test?

• Function

• Not a Function

• Quadratic

• Square Root

Does the graph represent a function? Does it pass the vertical line test?

• Yes, because the vertical line test shows there are no repeating input values

• No, because the vertical line test shows there are repeating input values that have different outputs.

• No, because there are not enough dots to tell

• Yes because the dots are all red

Does the mapping represent a function?

• It does represent a function because each input has one output.

• It does represent a function because each output has one input.

• It does not represent a function because an input has more than one output.

• It does not represent a function because an output has more than one input.

Which set of ordered pairs represents a function?

• {(3, 2), (4, 4), (6, 3), (4, 5)}

• {(4, –3), (4, –1), (4, 3), (4, 6)}

• {(–4, 4), (–2, 4), (1, 4), (5, 4)}

• {(–3, –3), (–2, –4), (–2, –1), (–1, –5)}

Look at the table.

Is the relation a function?

• Yes

• No

Look at this set of ordered pairs: (4, 13), (1, 12), (6, 9)

Is this relation a function?

• Yes

• No

Which of these relations is a function?

• 
• 
• 
• 

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