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To determine the slope of the line passing through the points (2, 1) and (4, 5), we can use the slope formula:
slope (m) = (y2 - y1) / (x2 - x1)
Plugging in the values from the points given:
m = (5 - 1) / (4 - 2) = 4 / 2 = 2
So, the slope of the line representing the path of the first airplane is 2.
A line that is parallel to another line will have the same slope, so the slope of a line that represents the path of another airplane that is traveling parallel to the first airplane will also be 2.