Question

for what purpose would authors use evidence to support their claims

Answer 1

To show the reader its true and not false, a kit if authors use evidence to support their own claims.

Answer 2

Answer:

To verify that what they're saying is correct

Explanation:

Authors want to use only true information in their work, so they look for evidence that deals with the same subject they are talking about. These evidences will serve to support their claims and show that these statements are correct. The result is that the work of these authors will be more credible with the public.