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30 August, 18:40

An aircraft travels with the wind for 120 miles in 0.75 of an hour. The return trip is flown against the wind and takes exactly 1 hour.

Which system of linear equations represents x, the speed of the plane in miles per hour, and y, the speed of the wind in miles per hour? Recall the formula d = rt.

0.75 (x + y) = 120

x - y = 120

0.75 (x - y) = 120

x + y = 120

120 (x + y) = 0.75

120 (x - y) = 1

120 (x - y) = 0.75

120 (x + y) = 1

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Answers (1)
  1. 30 August, 19:13
    0
    The first equation

    0.75 (x+y) = 120

    (x-y) = 120

    Because

    speed=distance by time

    so speed * time = distance

    0.75 and 1 hour is time and x+y and x-y is speed of plane depending on whether it flies against the wind or with the wind
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