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Axes The two perpendicular lines of a coordinate plane that intersect at the orgin. Coordinate Plane A plane formed by the intersection of a horizontal number line called the x-axis and the vertical number line called the y-axis Coordinates The numbers of an ordered pair that locate a point on a coordinate graph Function An input-output relationship that has exactly one output for each input Input The substituted into a expression or function Linear Equation An equatiion whose solutions from a straight line on a coordinate plane Negative number A number less than zero Opposites teo numbers that are an equal distance from zero on a number line Origin The point where the x-axis and y-axis interxect on the coordinate plane; (0,0). Output The value that results from the substitution of a given input into an expression or function Positive Number A number greater than zero Quadrants the x and y-axes divide the coordinate plane into four regions. Each region is called a quadrant x-axis The horizontal axis on a coordinate plane x-coordinate the first number in an ordered pair; it tells the distance to move right or left from the origins y-axis the vertical axis on a coordinate plane y-coordinate the second number in an ordered pair; it tells the distance to move up or down from the orgin