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n mathematics, a function f from a set X to a set Y is surjective (or onto), or a surjection, if every element y in Y has a corresponding element x in X such that f(x) = y.

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a visual way to determine if a curve is a graph of a function or not. A function can only have one output, y, for each unique input, x.

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A function for which every element of the range of the function corresponds to exactly one element of the domain.

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number as roman numerals on a coordinate plane graph.

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any function that graphs to a straight line. What this means mathematically is that the function has either one or two variables with no exponents or powers.

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a relationship or expression involving one or more variables.

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The difference between the lowest and highest values

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The set of values of the independent variable(s) for which a function or relation is defined. Typically, this is the set of x-values that give rise to real y-values. Note: Usually domain means domain of definition, but sometimes domain refers to a restricted domain.

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Axes are The horizontal number line (x-axis) and the vertical number line (y-axis) on the coordinate plane.

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a diagram showing the relation between variable quantities, typically of two variables, each measured along one of a pair of axes at right angles.