Sales of energy drinks in a country were 407 million gallons in 2010 and have increased by about 33.4 million gallons per year.

Question

Find an equation of a linear model to describe the situation

Answer 1

Rate of increase is 33.4m gallons, so if s represents sales in millions of gallons and t the time in years since 2010 then s=407+33.4t. For example, in 2010, t=0 and sales are 407 million gallons. In 2015, t=5 and s=407+167=574 million gallons.