A relation is anything on a cartesian plane (a graph).
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The domain is all the first coordinates in a relation. A relation is two ordered pairs.
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a function is a one-to-one and many-to one relation
Algebra is a branch of mathematics concerning the study of structures, relation and quantity. Together with geometry, analysis, combinatorics and number theory, Algebra is one of the main branches of mathematics.
Input is the first coordinate of an ordered pair in relationand Output is the second coordinate of an ordered pair in relation