HP 48g Graphing Calculator - Manual (Page 348)

8. For each known variable, type its value and press the
corresponding menu key. Press fNXT) if necessary to access
additional variables.
9. Optional: Supply a guess for the unknown variable(s). This can
speed the solution process or help to focus on one of several
solutions. Enter a guess just as you w^ould the value of a known
variable. If you are working with multiple equations, press Q}
and then the variable menu key MCflL after entering the guess
(reconverting the menu label to white),
10. Press o followed by the menu key of the variable for which
you’re solving. If you’re solving a set of equations, you can press
S) L -- to solve for all remaining unknown variables—all
variables not previously defined by you.
Using the Solver
25 When you select a subject and a title in the Equation Library,
you specify a set of one or more equations. Then, when you press
SuLV , you leave the Equation Library catalogs and start solving
the equations you’ve selected.
When you press S
does the following: in the Equation Library, the application
The set of equations is stored in the appropriate variable: EQ for
one equation, EQ and Mpar for more than one equation. (Mpar is a
reserved variable name used by the Multiple-Equation Solver.)
Each variable is created and set to zero unless it already exists. (If
the variable name has been used by the Solver before, then it is a
global variable and therefore already exists—until you purge it.)
Each variable’s units are set to the conditions you specified—SI
or English units, and units used or not used— unless the variable
already exists and has units dimensionally consistent with what you
specified, (To change from English to SI units or vice-versa, you
must first purge the existing variables
or explicitly enter the units
with the values.)
The appropriate solver is started: the SOLVR application (see page
18-7) for one equation, the Multiple-Equation Solver for more than
one equation.
25-2 The Equation Library