The video tutorial reviews the concept of functions, emphasizing that each input must have a unique output. It is divided into two parts: Part A involves analyzing graphs using the vertical line test to determine if they represent functions, while Part B focuses on identifying non-function relationships in a table by checking for repeated inputs with different outputs. The tutorial concludes with a summary of the key points discussed.

What is a function in mathematical terms?

• A relation where inputs and outputs are the same

• A relation where outputs are not related to inputs

• A relation where each input has exactly one unique output

• A relation where each input has multiple outputs

Which test is used to determine if a graph represents a function?

• Horizontal line test

• Diagonal line test

• Vertical line test

• Circular line test

If a graph passes the vertical line test, what does it indicate?

• The graph is a linear equation

• The graph has multiple outputs for each input

• The graph is a function

• The graph is not a function

In Part A, which graphs were identified as functions?

• Graph 2 and Graph 3

• Graph 1 and Graph 2

• Graph 1 and Graph 4

• Graph 3 and Graph 4

What makes a table of values not a function?

• All outputs are the same

• All inputs are different

• An input is repeated with different outputs

• Each input has a unique output

Which value, when repeated as an input, would make the table not a function?

• 11

• 9

• 7

• 5

What is the key takeaway about functions from the video?

• Functions have exactly one unique output for each input

• Functions are only applicable to graphs

• Functions are not important in mathematics

• Functions can have multiple outputs for each input