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PLEASE HELP I REALLY NEED HELP

PLEASE HELP I REALLY NEED HELP-example-1
User Flob
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Answer:

Explanation:

To be a function you cannot have multiple inputs/or x's

Relation 1 is a function all of the domains are different

Relation 2 is a function all of the domains are different

Relation 3 is not a function, you have multiple x's, -9 and -9, that are the same

Relation 4 is not a function, you have multiple inputs that are "r"

User Master Drools
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