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This document defines key concepts related to relations and functions including ordered pairs, coordinate planes, relations, functions, graphical representations, domain and range, and the vertical line test. It provides examples and explanations of these terms. Ordered pairs represent points on a graph and functions are defined as sets of ordered pairs where no x-value is repeated, while relations allow repeated x-values. The vertical line test can be used to determine if a relation qualifies as a function by checking if a vertical line passes through only one point for each x-value.Read less