Any point on y = x can be represented as (a,a)
Putting x = a in the equation y = x, we obtain the result y = a.
Hence, (a, a) is a general expression for any point on the line y = x.
Any point on the line represented by x−2y=0 can be written as (2a,a).
The distance of any point A (a, b) from the point P (x,y) is (x-a + y-b) units.
Lines perpendicular to the X axis are represented by the equation x = a
The distance of any point (x, y) from the origin is x+y.