HP 48gII - Manual (Page 254)

Page 7-20
Start the multiple equation solver by pressing J@SOLVE. The calculator
produces a screen labeled , "vel. & acc. polar coord.", that looks as follows:
To enter the values of the known variables, just type the value and press the
button corresponding to the variable to be entered. Use the following
keystrokes: 2.5 [ r ] 0.5 [ rD ] 1.5
\ [ rDD ] 2.3 [ θD ] 6.5 \ [ θDD ].
Notice that after you enter a particular value, the calculator displays the
variable and its value in the upper left corner of the display. We have now
entered the known variables. To calculate the unknowns we can proceed in
two ways:
a). Solve for individual variables, for example,
„[ vr ] gives vr: 0.500.
Press L„[ vθ ] to get vθ : 5.750 , and so on. The remaining results
are v: 5.77169819031; ar: -14.725; aθ: -13.95; and a:
20.2836911089.; or,
b). Solve for all variables at once, by pressing
„@ALL!. The calculator will
flash the solutions as it finds them. When the calculator stops, you can
press
‚@ALL! to list all results. For this case we have:
Pressing the soft-menu key
@EQNS will let you know the equations used to
solve for each of the values in the screen: