Function and Non-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.

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

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

• Function
• Not a Function

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

• Yes

• No

• 24

• -6

• 32

• 36

• 1

• 2

• -1

• 4

How would you write y = 2x - 3 in function notation?

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

• 8

• -24

• 24

• -22