How do you show infinite on a graph?

Question

It says "If any of the reactions never started(the speed was infinite) note that appropriately on your graph.

Answer 1

Consider the relation:
y = 1/(x-3)
As the value of x increases and approaches 3 the denominator becomes very small. And the division 1 divided by a very small number becomes very large.
We say the value of y approaches infinity as x approaches 3. You can use a figure 8 lying on its side. That's the symbol for infinity.

The graph would look like this:
http://s236.photobucket.com/albums/ff177/jsardi56/?action=view¤t=infinity9-29-07.jpg