(i) In a Cartesian plane, to determine the position of any point, horizontal line is called x-axis. Vertical line is y
The y-coordinate is also called the ordinate.
Horizontal line → xOx’
Vertical line → yOy’
(ii) The name of each part of the plane formed by these two lines is called Quadrant.
I Quadrant → xOy
II Quadrant → yOx’
III Quadrant → x’Oy’
IV Quadrant → y’Ox
(iii) The name of the point where these two lines intersect is called origin.
Coordinates of origin are (0. 0).