Input/Output Graphs

Other words for x-values.

• domain and input

• domain and range

• range and output

• input and output

How do we know if a relation is a function?

• The outputs each have one input.

• The inputs each have one output.

• The inputs and the outputs match.

• There is a coefficient with each input.

• Function
• Not a Function

Is this a function?

• Yes, it is a function.

• No, it is not a function.

Is this graph a function or not a function? 

• Function

• Not a Function

What output value goes in the "?" box?

What output value goes in the "?" box?

You can identify a function from a graph by using the.....

• Horizontal Line Test

• Eye Test

• Vertical Line Test

• Diagonal Line Test

Which graph does NOT pass the vertical line test?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

A function is a rule that assigns exactly ___ input to every output.