Answer:
A relation is any set of ordered-pair numbers.
The following diagram shows some examples of relations and functions. Scroll down the page for more examples and solutions on how to determine if a relation is a function.
Step-by-step explanation:
The pairing of the student number and his corresponding weight is a relation and can be written as a set of ordered-pair numbers.
W = {(1, 120), (2, 100), (3, 150), (4, 130)}
The set of all first elements is called the domain of the relation.
The domain of W = {1, 2, 3, 4}
The set of second elements is called the range of the relation.
The range of W = {120, 100, 150, 130}
