As part of a study on traffic conditions, the mayor of a small city tracks her driving time to work each day for 6 months and finds a linear and
increasing relationship. On day 1, her drive time was 17 min. By day 61 the
drive time had increased to 28 min. Find a linear function that models the
drive time and use it to estimate the drive time on day 121, if the trend
continues. Explain what the slope of the line means in this context.