How can I find the limits of these functions analytically:

1. Limit of (x-3)/(x-2) as x approaches 2 from the right

2. Limit of (x^2)/(x^2-9) as x approaches 3 from the right

I can determine the limit from its graph, but how can I do so without a graphing calculator. This question comes from a chapter about Limits and their Properties. A step by step answer will help a lot. Thanks.