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
30 August, 19:13
The first equation
0.75 (x+y) = 120
(x-y) = 120
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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» 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.