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an activity or purpose natural to or intended for a person or thing.

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Linear functions are those whose graph is a straight line. A linear function has the following form. y = f(x) = a + bx. A linear function has one independent variable and one dependent variable. The independent variable is x and the dependent variable is y

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In mathematics, the vertical line test is 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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In 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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an imaginary line about which a body rotates.

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denoting or referring to a situation in which two parties come into direct contact, opposition, or correspondence.

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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.

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the area of variation between upper and lower limits on a particular scale.

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an area of territory owned or controlled by a ruler or government.