did you already input your data? You have to press STAT then EDIT to input your data. When done, exit and press STAT again. Arrow over to CALC and scroll down to where is says LinReg(ax+b). Press ENTER twice and you get the variables for your Line of Regression. Now, press Y= and enter these numbers in the same order (don’t forget to input the variable X!!!!). Hit GRAPH and you should see your line. If not, try zooming in by pressing ZOOM and scrolling down to ZOOM IN and see if your line is hiding somewhere. If this fails, try pressing ZOOM and scrolling down to ZOOM FIT and press ENTER. This will center the screen around your line. If this doesn’t work, try another calculator.