The function is drawn on the range -5 < x < 10 and -5 < y < 10. You should enter a value of epsilon and then explore the consequences for your picture as you pick different values of delta
Of course, the function is continuous on the whole domain, but you should concentrate on graphically analyzing the fact that
First, pick a value of epsilon that you would like to work with.
(Values between 3 and 0.25 will look good on this scale.)