How to Graph on a TI-84 Plus: A Beginner's Walkthrough

Graphing on a TI-84 is really three separate steps that each have their own menu on the physical calculator: entering the equation, setting the viewing window, and then reading the result. Skipping the second step is the most common reason a graph looks like a blank screen — the function is there, just outside the window you’re looking at.

1. Enter the equation

On the physical device this is the Y= editor. You type a function of x — say Y1 = X^2 - 4 — and every enabled Y slot draws at once, which is how you compare multiple functions on the same axes.

2. Set the window

The WINDOW menu controls what range of x and y values are actually visible — Xmin/Xmax and Ymin/Ymax. The default window (roughly -10 to 10 on both axes) works for a lot of textbook problems, but a function with a vertex at (50, 200) will look empty until you widen the window to include it. ZoomFit and ZoomStandard exist specifically to fix this without you guessing at ranges by hand.

3. Read it: Trace and Zoom

TRACE drops a cursor onto the curve itself and lets you step along it with the arrow keys, reading off exact coordinates as you go — the fastest way to spot a root, a vertex, or a specific point without guessing from the pixel grid. Zoom In/Out rescales the window around the cursor when you need more or less detail in one area.

Try it yourself

Switch the TI-84 Calculator to Graph mode. Enter your function in the Functions tab, adjust the range in the Window tab if nothing shows up, then drag to pan and scroll to zoom directly on the canvas — Trace works the same way, stepping along the curve with the arrow keys once you click into the plot.