Texas Instruments TI-73 EXPLORER 用户手册

Chapter 9: Function Graphing     

7309ENG.DOC   CH 9 Function Graphing, English   Julie Hewlett   Revised: 07/29/98 12:14 PM   Printed: 05/19/99

9:01 AM   Page 165 of 24

 

For every cookie Tham eats, Antonio eats two. How many

cookies does Antonio eat if Tham eats 1 cookie, 2 cookies, 3

cookies, and 4 cookies?
Find the equation that represents the relationship between

how many cookies Tham eats and how many Antonio eats,

and represent your answers in the form of a function graph.

These steps explain what the calculator does internally when

you define a function graph. The next page shows how to use

the TIN73 to find the answers to this example.

1.  This example uses these

X values:

X=1

X=2

X=3

X=4

2. The TIN73 solves for Y

using specific X values.

Y = 2¦X
Y = 2¦1 = 2

Y = 2¦2 = 4

Y = 2¦3 = 6

Y = 2¦4 = 8

3. It generates a table of

(X, Y) coordinate pairs

for you to look at.

X

Y

1

2

2

4

3

6

4

8

4. It graphs the (X,Y) pairs.

³

Y=2X

X=number of cookies Tham eats

Y=number of cookies Antonio eats

2

2

3

4

5

1

0

4

6

6

8