Texas Instruments TI-73TP Teachers Guide - Page 22

Look at T-chart

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Patterns and Relations 17 Activity 4: Stadium Walls 10. Ask: What remains the same or constant? (1) What changes or varies? (L-number of lengths varies) What will the graph of the line represented by these equations look like? 11. The TI-73 uses X and Y when graphing, so change the equation B = 3L + 1 to Y = 3X + 1 using the Y= editor. a. On each line where there is an entry, clear the Y= editor. & : b. Now enter the equation. [ I \ Y 12. View the window. ' 13. Discuss the possible values for X and Y. Ask questions such as: What does X represent? (length) Do you need negative values for Xmin? (no) What would you suggest for Xmin? (Look at T-chart data.) What do you suggest for Xmax? What does Y represent? (number of beams) Do you need negative values for Ymin? What do you suggest for Ymin? (Look at T-chart data.) What do you suggest for Ymax? Should it be smaller or larger than Xmax? At the right is an example of an appropriate window. © 1998 TEXAS INSTRUMENTS INCORPORATED

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Patterns and Relations
Activity 4:
Stadium Walls
17
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
10. Ask:
What remains the same or constant?
(1)
What changes or varies?
(
L-
number of lengths varies)
What will the graph of the line represented by these
equations look like?
11. The TI-73 uses
X
and
Y
when graphing, so change the
equation
B = 3L + 1
to
Y = 3X + 1
using the Y= editor.
a.
On each line where there is an entry, clear the
Y= editor.
&
:
b.
Now enter the equation.
[
I
\
Y
12. View the window.
'
13. Discuss the possible values for
X
and
Y
. Ask questions
such as:
What does X represent?
(length)
Do you need negative values for Xmin?
(no)
What would you suggest for Xmin?
(Look at T-chart
data.)
What do you suggest for Xmax?
What does Y represent?
(number of beams)
Do you need negative values for Ymin?
What do you suggest for Ymin?
(Look at T-chart
data.)
What do you suggest for Ymax? Should it be smaller
or larger than Xmax?
At the right is an example of an appropriate window.