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.