To calculate and display a linear regression model, you will need to enter the data.

Data for this example:
L1: 3, 5, 8, 10, 15
L2: 7, 8, 12, 14, 17

To calculate the linear regression (ax+b), follow these steps:

1. Press m to enter the statistics menu.
2. Press the right arrow key › to reach the CALC menu.
3. Select option 4: LinReg(ax+b) or option 8: LinReg(a+bx).
4. Ensure XLIST is set at L1, YLIST is set at L2, and Store RegEQ is set at Y1 by pressing b Ž and 1:Y1.
5. Select the softkeys for CALCULATE by pressing d or f.
   Note: The graphing calculator will display the form of the equation as y=a+bx or y=ax+b and list the values for the two coefficients (a and b). It will store the regression equation to your Y1 function. The correlation coefficient (r and r^2) will be displayed if the diagnostics are on.

To graph the linear regression along with the statistical data, follow these steps:

1. Ensure your regression equation is stored in Y1.
2. Press a À.
3. Press 1 to enter PLOT1.
4. Press the down arrow key ≥ to the 1st graph TYPE, scatter plot.
5. Highlight ON and press = to turn the stat plot on and be sure that XLIST is L1 and YLIST is L2.
6. Press h.
7. Press f 9.