To calculate and display a linear regression model first, 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 dor 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.