Introduction to Functions

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

• Horizontal Line Test

• Eye Test

• Vertical Line Test

• Diagonal Line Test

Is the function linear or nonlinear?

• Linear Function

• Nonlinear Function

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

• -1

• 1

• 5

• -5

What is f(1)?

• 1

• 5

• 0

• 4

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

Is this a function? Explain.

• Yes; it passes the horizontal line test.

• No; it is not a straight line.

• Yes; it passes the vertical line test.

• No; there is a line connecting the dots.

Find f(2)

• 5

• 4

• 3

• 0

f(x) is the same thing as ______.

• y

• x

• input

• an equation

Which graph is not a function?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

Evaluate f(-2) if f(x) = x²+ 3.

• -1

• 1

• 7

• -7