function definition - an equation that has only one answer of y for every x, dependent variable - y-value, independent variable - x-value, not a function definition - 2 x-values (input) with differing y-values (outputs), a set of ordered pairs that represents a function - {(6, 9), (5, -4), (-3, 10) (4, 2)}, a set of ordered pairs that do NOT represent a function - {(-7, ), (4, 2), (-4, 5), (-4, -6)}, a graph representing a function, a graph that does NOT represent a function,

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