Your question is not at all clear. You
could "sketch" the graph by calculating several points: if x= 0,
so y= 0 or -1/2.
and
are points on the graph. Taking y= 0, we get, in exactly the same way,
which we had before,
. Get enough points that way and you can sketch the graph.
But I suspect that you are intended to
complete the square to see what kind of figure this is:
If you divide through by 2 you get
. Presumably you know that
. Comparing that to
, they match if a= 1/4 and we can make this a "perfect square by adding
. Doing that for both x and y,
or
. What kind of figure is that?