Function vs Not a Function from Graphs

Is this graph a function and how can you tell?

• Yes its a function cause it doesn't cross itself
• No it's not a function because it goes through the origin
• No it's not a function because the x value 4 has y values of  -2 & 2
• No it's not a function because the y value 4 has x values of  -2 & 2

Is this mapping a function and how can you tell?

• Yes its a function cause all the numbers have lines
• No it's not a function because there a 5 in both ovals
• No it's not a function because the x value 5 has y values of  2 & 9
• No it's not a function because the y value 5 has x values of  2 & 9

Is this table a function and how can you tell?

• Yes its a function because there are not variables for missing numbers
• No it's not a function because the numbers don't follow any pattern
• No it isn't a function because the x value 4 has y values of  7& 14
• No it's not a function because the y value 4 has x values of  7& 14

Is this set of ordered pairs a function and how can you tell?

• Yes its a function because no y values repeat
• No it's not a function because there are negative numbers
• No it isn't a function because an x value repeats but has different y values 
• No it isn't a function because an y value repeats but has different x values

Which of the following guarantees a table will not be a function?

• A x value repeats
• An y value repeats
• An x value repeats and has different y values
• A y value repeats and has different x values

Which of the following guarantees a set of ordered pairs will not be a function?

• An x value repeats
• A y value repeats
• An x value repeats and has different y values
• A y value repeats and has different x values

Which of the following guarantees a table will not be a function?

• An x value repeats
• A y value repeats
• An x value repeats and has different y values
• A y value repeats and has different x values

Which of the following guarantees a mapping will not be a function?

• A x value repeats
• An y value repeats
• An x value has two or more arrows leaving it
• A y value has two or more arrows arriving at it

Which of the following best describes a function?

• A special relationship where each x and y are individually paired
• A special relationship where each x value has only one y value 
• A special relationship where each y value has only one x value 
• A special relationship where each the x and y value and always equal 

How do you administer a vertical line test.

• You don't only doctor's are allowed to do those
• Draw lines straight across your graph and see if any hit the graph more than once
• Draw lines straight down your graph and see if any hit the graph more than once
• Check to see if the graph is a vertical line( straight up)