This document introduces coordinate graphs and ordered pairs. It defines a coordinate grid as a set of uniformly spaced horizontal and vertical lines used to locate points by their distance from two intersecting lines. The x-axis is the horizontal number line representing the dependent variable, while the y-axis is the vertical number line representing the independent variable. An ordered pair identifies a point's location by its x and y coordinates, with the x value found first by moving horizontally along the x-axis and then the y value found by moving vertically.