I am 8 years late, but I would like to thank you for making the most clear video on you tube during my times of need. You sir are a lifesaver. I couldn’t figure out how to do it, and my teacher isn’t doing her job.
Hmmm. Did you try checking your range? Press WINDOW and make sure that the number for "x-min" is less than the number for "x-max," and that the number for "y-min" is less than the number for "y-max."
Go over to the equal sign and press the over key on your keypad (the one going to the left when there is the left, up, down, right), and then press enter (the selector should be over the entire y1 part when you press enter). It will pull up a menu that will allow for you to edit that.
My x min is smaller than my x max and the same with y min and y max. I have the TI-84 Plus Silver Edition and when I do touch the apps button finance is the only thing that pops up