In reference to your second to last post: Ya, I made a program for geometry, but more specifically for the Distance Formula. You enter the points in the order they appear on the page, (like this if one point is (7,2) and the other point is (-54125+3,5) then you enter 7, then 2, then -3, then 5) and it goes through every step and shows you exactly what to write, without leaving any spaces in between numbers, (only works if the number is 3 digits or less) It was amazingly awesome for geometry, because we used the distance formula sooooooooo much!

As for the next question, there is TI Graph Link, but I don't know if it will work for a 84+ se, or if you can even find it nowadays....