Function: A vertical line will intersect the graph in one point. |
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Not a Function: A vertical line will intersect the graph in two or more points. |

CONCEPT CHECK:

Classify the following graph as a function or a relation:

Function: A vertical line will intersect the graph in one point. |
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Not a Function: A vertical line will intersect the graph in two or more points. |

CONCEPT CHECK:

Classify the following graph as a function or a relation: