Algebra Applications: Excercise

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Narrator: Everyone knows the value of exercise.

In particular aerobic exercise is great for your metabolism,

and for your heart.

Whether jogging, cycling, or swimming, aerobic exercise

exerts your heart muscle and helps your metabolism.

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Narrator: But as you get older the amount of aerobic

exercise changes.

The exertion on the heart needs to decrease with age.

For a twenty year old the maximum number of heartbeats

should not exceed two hundred beats per minute.

For a sixty year old, the maximum number of heartbeats

should not exceed one hundred sixty beats per minute.

There is a linear function that relates heartbeat to age,

y=220 - x , where y is the maximum number of

heartbeats per minute, and x is the age of the person.

Suppose that your health teacher wants you to create an

exercise chart that shows the maximum heart rate for people

aged fifteen to sixty-five.

Turn on the TI-Nspire.

Create a new document.

You may need to save a previous document.

Create a new graph window.

Input the function 220 - x and press ENTER.

Notice that there is no equation on screen.

This is because the y intercept, 220 is off the screen.

Change the WINDOW SETTINGS by pressing MENU, and under

WINDOW ZOOM select WINDOW SETTINGS.

Change x-min to 0, x-max to 70, y-min to 150, y-max to 250.

Now you can see the graph.

What we're interested in is generating a data table.

To do that click on CONTROL and T.

Change the table settings, selecting MENU, and under

TABLE select edit TABLE SETTINGS.

Change the table start value to 15 and tab your way to

the OK button and click on it.

You can now take this data table and bring it into a

spreadsheet or word processing program.

Simply highlight the data table and copy the data to

the clipboard.

Paste the data into your spreadsheet or word processing

program, format the table and print it.

You now have an aerobic exercise chart for people

from ages fifteen to sixty-five.

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