Identifying and Evaluating Functions

Is this a function or not a function

• Function

• Not a function

Is this a function or not a function

• Function

• Not a function

Answer explanation

Each input has one output!

Is this a function or not a function

• Function

• Not a function

What is the main characteristic of a function?

• Every input can have more than one output

• Inputs have different outputs every time

• Every input has only ONE output

• Inputs are dependent variables.

Find f(-2), if f(x) = 2x - 5

• f(-2) = -1

• f(-2) = -9

• f(-2) = 9

• f(-2) = 0

g(x) = 5 - 6x Find g(-5)

• g(-5) = -25

• g(-5) = 6

• g(-5) = 4

• g(-5) = 35

f(x) = 10 , Find f(x) = 3x + 1

• x = 3

• x = -3

• x = 31

• x = -31

f(x) = -12 , f(x) = 4x + 4

• x = 4

• x = -4

• x = 2

• x = -2

What does the x represent in a function?

• Output ; independent variable

• Input; dependent variable

• Output; dependent variable

• Input; independent variable

What does the y represent in a function?

• Input; independent variable

• Output; dependent variable

• Input; dependent variable

• Output; independent variable