Click the green flag. You will be asked to give a coefficient for the x-value. As you should know, a linear graph will be given in the form y=mx+b. The "m" value is the slope; that is the coefficient. After that, you must give the y-intercept, or the "b" value. When you enter that, a red line will slowly crawl across the screen, marking the path of the equation. When it reaches the other end, which should take at least 15 or so seconds, it will display a pulsating cursor on the y-intercept point on the graph. Press the up arrow key to change the x value by one, and the down arrow to change it by negative one. The Position variable will appear after the graph is complete, and displays the position of the cursor. Press space after the Position variable and pulsating cursor appear to restart the graph.
If the y value exceeds one hundred eighty, the graph and cursor will travel only across the top of the screen, never disappearing. However, the Position variable will still read the actual position of the cursor as if it was still following the line. Check out my other math projects: Polygon Generator Set Calculator