To find the constant of proportionality in the equation y = 7x, we can compare the given equation to the standard form of a proportionality equation, which is y = kx, where k represents the constant of proportionality.
Comparing both equations, we can see that the constant of proportionality in this case is 7. It means that for every increase of 1 in the number of road projects (x), the number of weeks it takes to complete all the projects (y) will increase by 7.
In other words, it indicates that completing each road project takes approximately 7 weeks, assuming all projects have the same level of difficulty and require the same amount of time and effort from the crew of workers.