HP 40gs User Manual page 98

hp40g+.book Page 2 Friday, December 9, 2005 1:03 AM
Define and
solve the
equations
8-2
example in the previous step). To solve a three-
equation set, press
displays three equations.
If the three-equation input form is displayed and you want
to solve a two-equation set, press
In this example, we are going to solve the following
equation set:
6x + 9y + 6z = 5
7x + 10y + 8z = 10
6x + 4y = 6
Hence we need the three-equation input form.
3. You define the equations you want to solve by
entering the co-efficients of each variable in each
equation and the constant term. Notice that the cursor
is immediately positioned at the co-efficient of x in the
first equation. Enter that co-efficient and press
.
4. The cursor moves to the next co-efficient. Enter that co-
efficient, press or
likewise until you have defined all the equations.
Note: you can enter the name of a variable for any
co-efficient or constant. Press
entering the name. The
Press that key to lock alphabetic entry mode. Press it
again to cancel the lock.
Once you have entered
enough values for the
solver to be able to
generate solutions,
those solutions appear
on the display. In the
example at the right,
the solver was able to find solutions for x, y, and z as
soon as the first co-efficient of the last equation was
entered.
. Now the input form
.
, and continue doing
and begin
menu key appears.
Linear Solver aplet
or