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x-intercept

the x-coordinate of the point where a graph intersects the x-axis

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linear function

a function whose graph forms a straight line

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linear equation

an equation that can be written in the form Ax+By=C, where A, B, and C are all real numbers, and A and B are not both zero

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slope

a measure of steepness of a line

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y-intercept

the y-coordinate of the point where a graph intersects the y-axis

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constant of variation

the constant k in a direct variation equation

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direct variation

a relationship between two variables, x and y, that can be written in the form y=kx, where k is a non zero constant

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perpendicular lines

lines that intersect at 90 degree angles

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parallel lines

lines in the same plane that do no intersect

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family of functions

a set of functions whose graphs have basic characteristics in common

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parent function

the most basic function of a family of functions, or the original function before a transformation is applied

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