Based on the equation y = -4x + 42, where y represents the number of complaints and x represents the average number of buses per hour:
1. Given that the average number of buses per hour is 3.5, we can substitute x = 3.5 into the equation to find the number of complaints in a day.
2. First, we calculate the number of buses in a day:
Buses in a day = 3.5 buses/hour * 24 hours = 84 buses
3. Substituting x = 3.5 into the equation:
y = -4(3.5) + 42
y = -14 + 42
y = 28
4. Therefore, based on the equation y = -4x + 42, if the average number of buses per hour is 3.5, the estimated number of complaints in a day would be 28.
