Identify Functions (Vertical Line Test)

• Function

• Not a function

• Function

• Not a function

• Function

• Not a function

• Function

• Not a function

Which graph does NOT pass the vertical line test? In other words, which graph is NOT a function?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

Which graph is NOT a function?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

A quick test that can be performed to check and see if a relation is a function is the ​ (a)  

• Vertical Line Test (VLT)

• Horizontal Line Test (HLT)

Tags

CCSS.8.F.A.1

Consider the graph of a relation. If a vertical line intersects the graph in two places at the point x = 3, what does this indicate about the relation?

• It is a function.

• It is not a function.

• It could be a function depending on the rest of the graph.

• It is a linear function.

Which graph does NOT pass the vertical line test?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

Given the graph of a relation, which of the following is true about using the vertical line test to determine if it is a function?

• If any vertical line intersects the graph at exactly one point, the relation is a function.

• If any vertical line intersects the graph at more than one point, the relation is a function.

• If every vertical line intersects the graph at exactly one point, the relation is a function.

• If every vertical line intersects the graph at more than one point, the relation is not a function.