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A one-to-many mapping (eg square root) Or a relation such as a member of the family. Or a relation such as narrating a story.
A relation is also a function if each member of the domain (or x-coordinate) is paired with only one member of the range (or y-coordinate). If the relation is a set of ordered pairs that consists of real numbers a graph can be created to visualize the relation. If a vertical line can be drawn and only crosses or intersects the graph at one point then the relation is also a function.
Not every relation is a function. But every function is a relation. Function is just a part of relation.
walang relation
A relation is anything on a cartesian plane (a graph).