Mathematics
Sue581
29

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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(1) Answers
jtown20

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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