analytic geometry
posted by angelic .
What can be said of points with equal ordinates? with equal abscissa?

All vertical lines have the same x's (abscissa)
e.g. Plot (3,4) , (3,7) , (3,1)
All horizontal lines have the same y's (ordinates)
e.g. Plot (3,4) , (2,4) , (1,4)