To find the regression equation, first hit STAT, cursor right to
CALC and select option 4:LinReg(ax+b). Now press 2nd 1 ,
2nd 2 , to specify the x list and y list. (REMEMBER THE COMMAS! You do not have to specify the lists if you are using L1 and L2 for your x and y-values, respectively.) Hit VARS, cursor right to
Y-VARS, select 1:Function... and Y1 (or
whichever function you would like) to specify where the regession equation will be saved.
You should now see the following on your home screen:
LinReg(ax+b) L1, L2, Y1 or LinReg(ax+b) Y1 (if you are using L1 and L2 for your lists)