Coordinate Plane - The plane containing the "x" axis and "y" axis; also referred to as a graph, coordinate point - Mark a coordinate point on a graph by starting from the origin and moving horizontally then vertically to coordinates. , x-axis - The line on a graph that runs horizontally (left-right) through zero., y-axis - The line on a graph that runs vertically (up-down) through zero., reflection - A reflection is a flip over a line; a point or shape can be reflected horizontally, vertically, or diagonally. , vertex; vertices - A point where two or more line segments meet. A corner., ordered pair - Two numbers written in a certain order. Usually written in parentheses like this: (12,5) Which can be used to show the position on a graph, where the "x" (horizontal) value is first, and the "y" (vertical) value is second. , quadrant - Any of the 4 areas made when we divide up a plane by an x and y axis, as shown. They are usually numbered I, II, III and IV, origin - The starting point. On a coordinate plane it is point (0,0),

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