Hi, I've done something really stupid. I found a Newton's Method program on the internet and copied it to my TI-83 Plus. This program let you put the function in Y1 and its derivative in Y2. Then, you ran the program, and once you input your first guess, you would hit the ENTER key as many times as you wanted and it would continue to guess the next number. However, the program had no end, and so you'd have to hit the "ON" button to stop it, which resulted in the ERR:BREAK message. So, today, I was using the program, and when I hit the ON button to end it, I accidentally hit "Goto" instead of "Quit" in the message that came up, and, before I could stop myself, hit "CLEAR" to clear the window, but instead deleted a line of code. Here's what remains of the program: Prompt X Lbl 0 X-Y1(X)/Y2(X)->X (deleted line) Goto 0 Can someone tell me what was in that line, please?