Is r=b2 + 1 proportional?

Yes, it was proportional ...

Step-by-step explanation:

To tell if 2 variables are directly proportional while looking at their graphs, note if their x-and y - intercept coordinates are changed by the same factor. If they are, they are proportional.

If you don't have a graph, you can tell if

2 variables are directly proportional by writing down the equation of the line.