Functions and Vertical Line Test

Function

Not a Function

Function

Not a Function

Function 

Not a Function 

Yes, there  is a repeated x-value. 

No, there aren't any repeated y-values. 

Yes, there are repeated y-values. 

No, there is a repeated x-value. 

Function 

Not a Function

(1,3), (2,6), (3,9), (4,12)

(3,1), (6,2), (9,3), (12,4)

Input and Output

Output and Input

Not a function, each input has more than one output

Yes it is a function, because each input has exactly on output

Not a function, input is equal to output

Yes it is a function, -1/2 is a fraction of 2

Yes, each input has one output

No, each input has more than one output

No, the cost of the movies is different

Yes, each output has one input

Has inputs and outputs

Every input has only ONE output

Inputs have different outputs every time

x-values and y-values

Function

Not a Function