Question

A relation is a function if _____.

there is exactly one input for each output
there is exactly one output for each input
there is more than one input for each output
there is more than one output for each input

Answer 1

I will give you the easy and fast way of solving these types of problems.
To see if the relation is a function then check if the Ｘ in all the coordinates are the same or different.
If there are any similar numbers for the Ｘ then that relation is not a function.
If there are no similar numbers for the Ｘ then that relation is a function．

Answer 2

Definition Relation
A relation is a correspondence between two sets A and B such that each element of set A
corresponds to one or more elements of set B. Set A is called the domain of the relation and set
B is called the range of the relation.
Definition Function
A function is a relation such that for each element in the domain, there corresponds exactly
one and only one element in the range. In other words, a function is a well-defined relation.

Answer 3

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