Patterns

Activity 6: Major Martian Headache

33

4.Guide students to see that the rule for making antenna muffs is heads ¦ 2 = number of antenna muffs. Show students how this also can be written as X ¦ 2 =Y.

5.Ask students: If there are 67 Martians in a community, how many antenna muffs would be needed?

6.On the TI-73, enter X ¦ 2 =Y into the Y= editor.

& I M Z

7.Explore for any given Martian community size by first setting up a table of values.

a.Access the TABLE SETUP screen.

- f (above the ' key)

b.Make sure the screen looks like the one shown at the right (TblStart=0, @Tbl=1, Indpnt: Auto, Depend: Auto).

8.Show on the TI-73 a table of values for the equation.

- i (above the * key)

9.Move around on the table and find the number of antenna muffs needed for a community of 67 Martians.

$ and #

10.To find the number of antennas for even larger communities, go back to the TABLE SETUP screen and change TblStart to a larger amount, such as 1000.

- f

11.Display the table.

- i

The TI-73 displays the multiplication symbol as an asterisk ¦.

© 1998 TEXAS INSTRUMENTS INCORPORATED