Vertical Line Test Explained

What is the primary purpose of the Vertical Line Test?

• To determine if a graph is linear

• To identify the y-intercept of a graph

• To find the slope of a line

• To check if a relation is a function

Which of the following indicates that a relation is not a function?

• The graph is a straight line

• Some x-values repeat

• The graph passes the Vertical Line Test

• All x-values are different

What happens if an x-value repeats in a relation?

• The points will line up vertically

• The relation will have no y-values

• The points will line up horizontally

• The relation is always a function

How do you use a pencil to apply the Vertical Line Test?

• Move it vertically across the graph

• Place it at the origin and rotate

• Move it horizontally across the graph

• Draw a diagonal line across the graph

What does it mean if a vertical line touches more than one point on a graph?

• The graph represents a function

• The graph does not represent a function

• The graph is linear

• The graph is quadratic

In a mapping diagram, how can you easily determine if a relation is a function?

• Check if the graph is a curve

• Check if the graph is a straight line

• Check if any x-values repeat

• Check if any y-values repeat

What should you do if a vertical line hits more than one spot on a graph?

• Conclude that it is a function

• Conclude that it is not a function

• Check the slope of the line

• Check the y-values

In the interactive session, what did the students use to apply the Vertical Line Test?

• A compass

• A pencil

• A ruler

• A protractor

What was the result when the vertical line test was applied to the bolded parallelogram?

• It was a quadratic function

• It was a function

• It was not a function

• It was a linear function

What did the students conclude about the graph that had all different x-values?

• It was a linear function

• It was a function

• It was not a function

• It was a quadratic function