Example 1
In which quadrant(s) do both the x- and y-coordinates have the same sign?
Example 2
If a point has a y-coordinate of zero, which axis does it lie on?
Example 3
Do the points (-8, -1), (-6, 1), (-4, 3) and (0, 7) lie in a straight line?
Example 4
What type of quadrilateral do the points (-3, 1), (4, 1), (2, -2) and (-5, -2) form?