Aplane travels 2,000 kilometers at a speed of 900 kilometers per hour (kph) with no wind. when a tailwind is present, the plane’s speed increases by x kilometers per hour. the time it takes the plane to travel the same distance with the tailwind, t(x), is defined by the function . what is the meaning of the y-intercept for this function?

In order to interpret that function, first, we have to construct it. It takes  hours for the plane to travel with no wind. When speed increases because of a tailwind, time decreases accordingly. So that, time is now equal to . A general formula for time is 

Interpretation of the y-intercept is that when x=0, it is the case of without tailwind when it takes hours to complete the travel