HP 39gII Quick Start Manual page 48

Table 15 Linear Explorer
Summary of Functionality
The Linear Explorer opens in the Plot view with GRAPH mode active. The left half of the
display shows the graph of a linear function. The right half shows the general form of the
equation being explored at the top. Under that is the current equation of that form. The keys
used to control the app appear below the equation, and the x- and y-intercepts appear at
the bottom. Press SHIFT Backspace (Clear) and then the OK menu key to reset the app at
any time. The menu keys are:
• EQ: when active, uses the cursor keys to switch between parameters in the equation and
change their values
• GRAPH: when active, uses the cursor keys to manipulate the graph
• INCn: toggles the increment by which parameter values change
• LEVn: toggles between y=ax and y=ax+b linear equations
• TEST: enters the Test View of the app
In GRAPH mode, you change the shape of the graph directly and observe the effect on the
parameters of the equation. The active keys are:
• Use the up- and down-cursor keys to translate the graph (changes the intercept)
• Use the + and - keys to dilate the graph (changes the slope)
• Use the (-) key to reflect the graph over the y-axis (changes the sign of the slope)
If the LEV n menu key is set to LEV 1 (for y=ax), then the up- and down-cursor keys do not
work and this is reflected in the set of active keys. Press the GRAPH menu key to return to this
mode at any time.
42 HP Apps: Solvers and Explorers
View Name and Display
Plot View
GRAPH Mode