Step 1:

Measure the length of your forearm (in inches) from elbow to wrist.

Record your height (in inches).

Step 2:

Find a partner from the class or someone in your life who can measure.

Exchange your measurements. This will give you two ordered pairs: (forearm length, height)

Step 3:

Use your ordered pairs to find the slope

Using the slope you obtained and your personal measurements, use point-slope form to get your equation

Solve for y so that it is in slope-intercept form

Step 4:

Graph the line on the Desmos website using the y-intercept, your point, and your partner's point. If you are correct, your line should go through all three.

In your Discussion Post:

Tell us who your partner is

Show the work to find the slope

Show the work to get the equation

Include the graph

Replies

Put your arm length in for x in the equation of your classmate, and see what height it corresponds with. Compare this to your actual height. Is it close? Very much off? Do you think this equation is good for predicting someone's height?