I have this equation: y = 0.3989x + 0.032. So I have this paper helicopter that I drop from a constant height and I see how long it takes for it to reach the ground. the manipulated variable is the length of the helicopter's wings, so each time I drop it, I make the wings smaller and smaller (10cm, 8cm, 6cm, 4cm, and 2cm). and I see how length of the wings affects the time it takes to reach the ground. Based off the equation y=mx+b, I need to explain why my slope and y-intercept value makes sense. I am stuck on why the slope should be 0.3989. can someone explain that to me?

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vishal_kothari · Answer

http://www.purplemath.com/modules/slope.htm