A and B are two points on the x-axis and y-axis respectively.

(i) Write down the coordinates of A and B.

(ii) P is a point on AB such that AP : PB = 3 : 1. Using section formula, find the coordinates of point P.

(iii) Find the equation of a line passing through P and perpendicular to AB.

The inclination of every line parallel to the x-axis is:

1. 0°

2. 90°

3. 180°

4. none of these

The slope of a horizontal line is:

1. 0

2. 1

3. 2

4. not defined