Given that between 1980 and 1990, the population of Naples, Florida increased by approximately 6000 people per year. In 1980, the population was 80,000.
The population increased 6000 people per year. (This is the constant ratio of change, because it offers information about the relation between variables).
In 1980, the population was 80,000. (This is the initial condition, the population at the beginning of the period, that's why is the y-intercept of the function).
We know that the linear form has an explicit form
Where is the constant ratio of change and is the y-intercept. Replacing given values, we have
36-9=25 thus it isn't possible because it's not between 31 and 37. 48-9=39 hence also not possible. However for 42, it is defintely possible. Thus answer is 7
