Introduction to 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.

Is this relation a function?

• Function

• Not a function

Is this relation a function?

• Function

• Not a function

Is this graph a function or not a function? 

• Function 

• Not a Function 

You can identify a function from a graph by using the.....

• Horizontal Line Test

• Eye Test

• Vertical Line Test

• Diagonal Line Test

Evaluate f(-2) if f(x) = x+3

• -1

• 1

• 5

• -5

What is f(1)?

• 1

• 5

• 0

• 4

If f(x) = x - 5, what is the value of x when f(x) = 15?

• 20

• 10

• 5

• 0

if f(x) equals -x+8, what is f (12)?

• -4

• -8

• 4

• 8

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3