The pair of equation x = a and y = b graphically represents lines which are

1. parallel

2. intersecting at (b, a)

3. coincident

4. intersecting at (a, b)

The distance of the point P(2, 3) from the x-axis is

1. 2 units

2. 3 units

3. 1 unit

4. 5 units

The distance between the points A(0, 6) and B(0, -2) is

1. 6 units

2. 8 units

3. 4 units

4. 2 units