The TI-84 Plus C calculator allows you to change the TraceStep. The TraceStep is the amount the x-value changes each time you press right- or left-arrow keys when tracing a function. The default TraceStep is approximately 0.1515151515. Customizing the TraceStep is easy and can be done by following these steps:
Press [WINDOW] to access the Window editor.
See the second screen.
Use the down-arrow to move your cursor the last line, titled TraceStep.
Enter your desired TraceStep.
After pressing [TRACE], your Trace cursor will move by the amount of the TraceStep value you entered each time you use
![image0.jpg](https://cdn.prod.website-files.com/6634a8f8dd9b2a63c9e6be83/669d4674ac9c5ee9b6dcee52_398761.image0.jpeg)
Be careful, changing the TraceStep will automatically change the Xmax value as well. This can be quite a shock the first time it happens.
There’s a hidden feature that works after you hit [TRACE]. See the first screen in the following figure. If you want to start tracing your function at a specific value of the independent variable x, just key in that value and press [ENTER] when you’re finished. (The value you assign to x must be between Xmin and Xmax; if it isn't, you get an error message.)
![image1.jpg](https://cdn.prod.website-files.com/6634a8f8dd9b2a63c9e6be83/669d469b6774be325476e53b_398843.image1.jpeg)
When you’re entering the x-value, your calculator displays the number you’re entering in the border at the bottom of your screen, as shown in the second screen.
After you press [ENTER], the Trace cursor moves to the point on the graph having the x-coordinate you just entered. See the third screen. This is an easy way to quickly substitute x-values into a function and see the output (y-values) as well as the nice visual of the Trace cursor on the graph itself. Pretty neat stuff, don’t you think?