Final answer:
The linear equation that best describes the given model is y = 2x + 5.
Step-by-step explanation:
The equation y = mx + b represents a linear equation, where m is the slope and b is the y-intercept. In this case, the equation that best describes the given model is A) y = 2x + 5. This equation means that for every additional bus per hour, the company receives an average of 2 additional complaints. The y-intercept of 5 represents the base number of complaints the company receives when there are no buses running.