Here's the question you clicked on:
Jimboslice
Select the coordinates of two points on the line y = 8. (8, 8) and (8, 0) (8, -8) and (8, 8) (0, 8) and (8, 0) (0, 8) and (8, 8)
On the line y = 8, x can be anything and y = 8, so all coordinates on that line look like (x,8) where x can be anything.
i dont get it.. @Matt.Mawson