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202

Chapter 15: Equation Solving

15EQSOLV.DOC TI-86, Chap 15, US English Bob Fedorisko Revised: 02/13/01 2:34 PM Printed: 02/13/01 3:04 PM Page 202 of 12

Preview: The Equation Solver

- t

With the equation solver, you can enter an expression or equation, store values to all but
one variable in the expression or equation, and then solve for the unknown variable. These
steps introduce the solver. For details, read this chapter.

� Display the equation-entry editor. The

VARS

EQU

menu is displayed on the

bottom of the screen.

� Enter an equation. When you press

b, the interactive-solver editor and
solver menu are displayed.

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1 ã

ä 1 ã

ä D

1 ã

F D

1 ã

E E

� Enter values for each variable, except the

unknown variable

. Some variables

may have values stored to them already.

� Move the cursor to the variable for which

you want to solve. You may enter a guess.

100

# #

� Solve the equation for the variable. Small

squares mark both the solution variable
and the equation

left

rt=0

(the left side of

the equation minus the right side of the
equation). If you edit a value or leave the
screen, the squares disappear.

The

VARS

EQU

menu is a

menu version of the

VARS

EQU

screen (Chapter 2).

The example uses a formula
for a voltage divider.

and

represent

resistors.

and

represent voltage.

To solve for the unknown
variable in an equation on the
home screen or in the
program editor, select

Solver(

from the

CATALOG

(A to Z

Reference).