The website you made was fun. Because the homework site you made was great because it made me learn more about math. It made me learn about times tables.
I suspect you’re talking about the tutorials for 4th and 5th grade math put together by Duke University Program in Education. We’re glad that you found them useful.
2x*+6x+xy+3y
*= to the second power
Yes, it’s a quadratic equation. It will be a curvy line in 2-dimensional space.