Model 1 with the base ten unit

I'm confused on this could anyone me and show me what i need to do to solve it.

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)