Patterns and Relations

Activity 4: Stadium Walls

17

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.

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