I think there's a good idea in there, but it's likely to confuse as is. It seems unhelpful at best to have the task to be to determine a function involving only x and y, but then you to have to click on t, and somehow that implicitly changes x and y values.
They should, in my view, have had y as a function of t, and dropped x. Or another solution that doesn't create confusion.
I also think it's weird that changing the equation changes the shape of the mountain, but the text is about changing the path of the sled.
They should, in my view, have had y as a function of t, and dropped x. Or another solution that doesn't create confusion.
I also think it's weird that changing the equation changes the shape of the mountain, but the text is about changing the path of the sled.