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

Does this mapping diagram represent a function?

• No, because an input value goes to multiple output values
• Yes, because each input goes to one and only one output

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 this graph a function or not a function? 

• Function 
• Not a Function

• Function
• Not a Function

Is the function linear or nonlinear?

• Linear
• Nonlinear

Is the function linear or nonlinear?

• Linear
• Nonlinear

Is the function linear or nonlinear?

• Linear
• Nonlinear

Is the function linear or nonlinear?

• Linear
• Nonlinear

Is the function linear or nonlinear?
y = x² + 7

• Linear
• Nonlinear