• Using measuring tape, measure the length of your arm (in inches) from elbow to wrist.Also record your height (in inches)
• Find a partner and exchange your measurements.This will give you two ordered pairs: (arm length, height)
• Each of you should use your ordered pairs to find the slope, and compare to make sure you have the same answer.

An alternate equation for a line isYou can get this in slope-intercept form by plugging in an ordered pair and the slope, and then solving for y.This is called point-slope form.

• Using the slope you obtained and your personal measurements, use the above equation to get your equation.Solve for y so that it is in slope-intercept form.
• Verify that your partner gets the same equation.
• Graph the line using the y-intercept, your point, and your partner's point.If you are correct, your line should go through all three.
• Tell us who your partner is
• find the slope
• get the equation
• Include the graph

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?