Question

What do you mean by abscissa and cordinate ? What is the cordinate of the origin?

Answer 1

the horizontal coordinate of a point in a plane Cartesian coordinate system obtainedby measuring parallel to the x-axis this is known as abscissa
The center of the coordinate system (where the lines intersect) is called the origin

The ordinate is the y-coordinate of a point on the coordinate plane. 
The distance along the vertical (y) axis.