Texas Instruments TI-84 Plus Manual Book page 317

2. Press the cursor navigation keys (} † | ~ ) to move
the cursor to the desired location. Press Í to select
the first point.
3. Press the cursor navigation keys (} † | ~ ) to move
the cursor to the second location. Press Í. This
displays a line containing the two points selected.
The linear function is displayed. The Manual-Fit Line equation displays in the form of
Y=mX+b. The current value of the first parameter (m) is highlighted in the symbolic
expression.
Modify parameter values
Press the cursor navigation keys ( | ~ ) to move from the first parameter (m) or (b) the
second parameter. You can press Í and type a new parameter value. Press Í
to display the new parameter value. When you edit the value of the selected parameter,
the edit can include insert, delete, type over, or mathematical expression.
The screen dynamically displays the revised parameter value. Press Í to complete
the modification of the selected parameter, save the value, and refresh the displayed
graph. The system displays the revised parameter value in the symbolic expression
Y=mX+B, and refreshes the graph with the updated Manual-Fit Line.
Chapter 12: Statistics 314