How to combine your blog and Tumblr blog?

Question

Search Engine Optimization

SEO question.
How using your blog in conjunction with Tumblr can affect. For example, there is a blog on Wordpress and I additionally copy the content on Tumblr. Is this good or bad for search engine promotion?
Or alternatively use Tumblr annotations and link to the main site.
The other option I see is to make content that is more topical, possibly more entertaining, on Tumblr and link it to the site later on.

Answer 1

You can use it, but on the condition that on tumblr you will create a post as a link with WP

Answer 2

If the blog is very simple (post and hashtags), then you can connect Tumblr to your own domain, and demolish WP.