Mentor: Look at one of the graphs you have a question about. Then take a vertical line and place it on the graph. If the graph is a function, then no matter where on the graph you place the vertical line, the graph should only cross the vertical line once.

How do you graph on a TI 84 Plus?

On the TI-83 and TI-84, this is done by going to the function screen by pressing the “Y=” button and entering the function into one of the lines. After the function has been entered, press the “GRAPH” button, and the calculator will draw the graph for you.

What does a piecewise graph look like?

These graphs may be continuous, or they may contain “breaks”. Because these graphs tend to look like “pieces” glued together to form a graph, they are referred to as “piecewise” functions (piecewise defined functions), or “split-definition” functions.