Identifying Graphs with Functions

Which of the following is a function?

• A

• B

• C

• D

Is the following graph a function?

• Yes, because the x never repeats.

• Yes, because they are individual dots.

• No, because the x repeats.

• No, because it is not a line.

The following is not a function because...

• There are two values that equal 2.

• x = 10 and x = 40 has two values each.

• In the f(x) column, the 5 repeats.

• This table is actually a function.

Is the following graph a function?

• Yes it is a function.

• No, it is not a function.

• There is not enough information to answer this question.

 Every morning, Tom walks along a straight road from his home to the bus stop. Below, is a graph representing Tom’s trip to school.
- What is the distance covered through the second segment, which is between 50 seconds, and 70 seconds?

• 40 meters

• 60 meters

• 80 meters

• 20 meters

Describe the situation.

• Sales decrease quickly at a constant rate, and then increase slowly at a constant rate.

• Sales stay constant, then decrease at a constant rate, and increase slowly.  

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

Is the relation a function? Why.

• Yes, because the x-value 11 has two y-values pair with it.

• Yes, because each x-value has only one y-value paired with it.

• No, because the x-value 11 has two y-values pair with it.

• No, because each x-value has only one y-value paired with it.

Which of the graphs are examples of functions?

• 
• 
• 
• 

Does the table represent a function?

• Yes

• No