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 set of values 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)

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

Is this table a function or not a function?

• Function

• Not a Function

Is this mapping 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 table a function or not a function?

• Function

• Not a Function

Give the domain and range. Tell if it is a function.

• D: {-4, -2, 0, 2}

  R: {-2, -2, 1, 1}

  Function

• D: {-4, -2, 0, 2}

  R: {-2, 1}

  Function

• D: {-4, -2, 0, 2}

  R: {-2, -2, 1, 1}

  Not a Function

• D: {-4, -2, 0, 2}

  R: {-2, 1}

  Not a Function