HELP AND EXPLAIN

9. Sales of a software company increased linearly from $120,000 in 2006 to $180,000 in 2010. Follow the steps to write an equation to model the sales, y, in the year, x. Let x=0 correspond to the year 2006. a) Represent the given data as two points, for example, (0, 120000). b) Find the rate of change, the slope. c) Write an equation in point-slope form