The number of miles y, that a train is from a station after x hours is given by the function y=150-3x.

Answer 1

Based on this information, in order to calculate the numbers of miles after x hours (a certain time), plug in the time in hours for x and complete the calculation to solve the problem. For example, after 10 hours, this is the distance in miles that the train has travelled from the station:

y = 150 - 3(10) = 150 - 30 = 120 miles.