In parentheses are ordered pairs of real numbers, such as (2,3), where the x axis is equal to 2 and the y axis is equal to 3. You can draw a straight line perpendicular to the X axis at x=2 and a straight line perpendicular to the Y axis at y=3. The point where two straight lines intersect is the coordinate of this point, and other points can be drawn in this way! ! !