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The populations, in thousands, of two towns are shown in the graph, where the horizontal axis measures the time in years.
Which town's population is growing at a faster rate?
This question asks which town's population is growing at a faster rate.
Since both population graphs are straight lines, we compare their slopes.
The slope of a line represents the rate of change:
From the graph:
Town A starts at about thousand people and increases at a rate of about thousand people per year.
Town B starts at about thousand people and increases at a rate of about thousand people per year.
Even though Town A starts with a larger population, the question asks about the growth rate, not the starting population.
Compare the rates:
So Town B is growing faster than Town A.