HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

Now press and you will see the calculator find the nearest

solution to your guess. Finish by pressing

to verify that the solution

is valid. See page

106 for more information regarding this.

Obviously the next step is to change back to the

PLOT view, move the

cursor near to the second intersection and

for that one too.

If we now change the active variable then there is an immediate change

in the

PLOT view to reflect this.

Change back to the

NUM view and restore the variables to the original

values, this time leaving the highlight on

Since the active variable is now

C, substitution of all other values means

that

B C ⋅+C = 05 *

+=⋅5*B becomes 04 ⋅ . In this case both sides

are linear and this is shown in the

PLOT view. Notice that the axis label

is now

C. This would have only one solution and there would be no

need to supply any particular starting value.

If we duplicate this process for

A then substitution of values means that

+=⋅5*B becomes A 105

B C −= ⋅. Both sides are still linear,

although not the same linear equations as before, and this is shown in

the

PLOT view. Notice that the axis label is now A.

111