Statement :

Test intervals must be used in order to get an accurate graph of a rational function.

Reason :

The test intervals are used to determine the location of points on the graph.

Because many rational functions are not continuous, one interval may include values that are vastly different than the next interval.

Therefore, at least and preferably more than , point is needed for every interval in order to sketch a reasonably accurate graph of the function.

At least or more than point is needed for every interval in order to sketch a reasonably accurate graph of the function.