Lesson 18 Review: Answer the following questions. 1. In your own words, describe the following: a.) Cartesian Coordinate System b.) The uses of the system c.) Who developed the system? d.) Historically, why is the system unique? 2. Use the list below to write the correct term for each denition on the line provided. axes (of a graph) coordinates coordinate grid intersection number line ordered pair origin quadrant x-axis Xcoordinate yaxis ycoordinate a.) the rst number of an ordered pair b.) the second number of an ordered pair c.) any of four regions formed by the axes in a rectangular coordinate system d.) the point at which two lines meet