Since the horizontal distance is deprndent on the length of the catapult, we would plot the values of the horizontal distance on the vertical or y axis and the length of catapult arm on the horizontal or y axis. The scatter plot showing the line of best fit is shown below
The equation of the line of best fit is written as
y = mx + b
where
m = slope
b = y intercept
From the calculations,
slope = 3.6
y intercept = 202.6
Thus, the equation of the line of best fit is
y = 3.6x + 202.6