Algebra-2

To determine which graph represent a function, we can use the vertical line test to check each graph to see if any vertical line drawn through the graph intersects it at most once.

 

Graph A

Each vertical line intersects each line segment at most once.

This graph represents a function because no input is repeated with different outputs.

 

Graph B

When x=5, there are two corresponding y-values: -2 and 2. This violates the vertical line test.

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