Algebra and statistics

Question

Amy’s yearly salary is given by an equation y= 25000 + 700x, where x is the number of y is her salary in dollars. What has been her yearly raise since 2007. Include correct units.

Answer 1

Assuming x is the number of years Amy has worked with the company, her yearly raise would be the first derivative of the function with respect to x. In simpler terms, you only need to look at the part of the equation that's changing: since her salary increases by $700 for each year that passes, her yearly raise in any given year is $700.