I cannot even begin to describe how much I despise this horrible website. If you get something even slightly off, such as graphing a y intercept at 4.8 instead of 5, the entire problem is wrong. This website leaves no room for error and expects precision and perfection, which of course most humans cannot reach. My school very suddenly switched to this site at the start of this year and everyone hates it INCLUDING THE TEACHERS. Overall, it's a very frustrating site to use and if I could give it zero stars I would.