Function or Not a Function?

In order to be a function the following must be true.

• each x value has only one y value
• each y value has only one x value
• each x  has only one y & each y has only one x 
• each x and y are equal

Is this graph a function or not a function? 

• Function
• Not a Function

• Function
• Not a Function

Which of the following statements is true about a function?

• A graph passes the vertical line test

• A graph does not pass the veritcal line test.

• Function
• Not a Function

• Function
• Not a Function

Is this graph a function or not a function? 

• Function 
• Not a Function

• Function
• Not a Function

• Function
• Not a Function

Which graph does NOT pass the vertical line test?

• Graph 1
• Graph 2
• Graph 3
• Graph 4