Answer: See below
Explanation:
a. The ordered pairs (0, -6) and (0, -11) have in common they have the same value on the X-axis.
This means the to point while on diferrent height are one upon the other on the plain, which mean they create a line that is perpendicular to the Y-axis and totaly perpendicular to the X-axis.
b. To calculate the distance between two points on a 2-d space, we can use the following equation:
Distance (D) =

Where the ordered pair
defines one point and
defines the other.
D =

D = 5
The distance between the two points
and
is 5