Texas-instruments TI-85 Manuel d'utilisateur télécharger pdf (Page 5)

Chapter 1 Ingredients of Change:

Functions and Linear Models

& 1.1 Fundamentals of Modeling

There are many uses for a function that is entered in the graphing list. Graphing the function

in an appropriate viewing window is one of these. Because you must enter all functions on one

line (that is, you cannot write fractions and exponents the same way you do on paper) it is

very important to have a good understanding of the calculatorÕs order of operations and to

use parentheses whenever they are needed.

1.1.1 ENTERING AN EQUATION IN THE GRAPHING LIST Press

GRAPH F1 (y(x)=) to access the graphing list. Up to 99 equations can be entered in the

graphing list, and the output variables are called by the names y1, y2, etc. When you intend

to graph an equation you enter in the list, you must use x

as the input variable.

If there are any previously entered equations that you will

no longer use, clear them out of the graphing list.

Position the cursor on the line

containing the equation and

press CLEAR or F4 (DELf) .

Suppose you want to graph A = 1000(1 + 0.05)

. Because we intend to graph this equation,

the input must be called x. Type x

by pressing x-VAR or F1 (x) , not the times sign ✕ .

TI 85 For convenience, we use the first, or y1, location

in the graphing list. Enter the right hand side as

1000(1 + 0.05)^x

TI 86 For convenience, we use the first, or y1, location

in the graphing list. Enter the right hand side as

1000(1 + 0.05)^x

Plot1, Plot2, and Plot3 at the top of the y(x)= list should

not be darkened. If any of them are, use until you

are on the darkened plot name. Press ENTER to make

the name(s) not dark.

1.1.2 DRAWING A GRAPH If you have not already done so, enter the equation in the

y(x)= list using x as the input variable before drawing a graph. We now draw the graph of

y = 1000(1 + 0.05)

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Texas-instruments TI-85 Manuel d'utilisateur Page 5