Press the "Y=" key, which is located at the top left of the keypad. A new screen will appear with a list of Ys with equal signs.
Enter the inequality to the right of the first "Y=." For this example, the inequality is 2x - 1 > 3. To enter the x-variable, press the "X, T, Θ, n" key. To enter the ">" sign, press the "2nd" key, and then press the "Math" key. Press the down arrow key to scroll to the appropriate inequality sign, then press "Enter."
Press the "Graph" key located to the top right of the keypad. The number line will be represented on the ensuing graph.