Understanding Functions and Nonfunctions

What is the key characteristic of a function when using tables?

• Each y-value is paired with only one x-value.

• Each y-value is paired with multiple x-values.

• Each x-value is paired with only one y-value.

• Each x-value can be paired with multiple y-values.

What does the vertical line test help determine about a graph?

• If the graph is a straight line.

• If the graph represents a function.

• If the graph has a maximum point.

• If the graph is symmetrical.

In the context of graphs, what indicates that a graph is not a function?

• A horizontal line touches the graph at more than one point.

• The graph is a curve.

• The graph is a straight line.

• A vertical line touches the graph at more than one point.

When examining a set of points, what indicates a nonfunction?

• All x-values are unique.

• An x-value is paired with different y-values.

• All y-values are unique.

• A y-value is paired with different x-values.

What should you check for in a set of points to confirm it is a function?

• Repeated x-values with different y-values.

• Unique x-values.

• Repeated y-values.

• Unique y-values.