What are the co-vertices of the following graph?
Solution: –
This is an ellipse with a center at (-1, 0), foci (-1 – 
, 0) and (-1 + , 0), vertices (-3, 0) and (1, 0) and co-vertices (-1, -1) and (-1, 1).
So the co-vertices is (-1, -1) and (-1, 1).