No problem! The easiest way to find help with a topic is to use the search bar on the top right of the page and search "Math Help" to find a video explanation. When you search for direct variation, you will be taken to Algebra II -- Functions -- Direct Variation also located at https://www.brightstorm.com/d/math/s/algebra-2/u/functions/t/direct-variation-2
Indirect variation is the topic right after that. Unfortunately, we don't have statistics yet so least squares regression isn't in our library.