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一、正确理解定义平面直角坐标系是由平面内两条互相垂直且有公共原点的数轴组成的．平面上的点的确定是用有序实数对来表达的,这里的“有序”是不容颠倒的,通常规定横坐标在纵坐标的前面．
First, the correct understanding of the definition of the plane rectangular coordinate system is composed of two axes perpendicular to each other in the plane and a common origin. The determination of the points on the plane is expressed by an ordered pair of real numbers. Here the “order” is not upside down. It is usually stipulated that the abscissa is in front of the ordinate.