Solve.
-Using data from 2010-2012, the annual number of cars sold at a certain dealership can be modeled by the formula y = 4x + 3, where y is the number of cars, in thousands, sold x years after 2010. According to this formula, in which years will the number of cars sold exceed 31 thousand?
A) Years after 2017
B) Years after 2019
C) Years after 2021
D) Years after 2015

Question

Quizplus · Accepted Answer

To find when the number of cars sold exceeds 31 thousand, solve the inequality 4x + 3 > 31. Subtract 3 from both sides to get 4x > 28, then divide by 4 to get x > 7. Since x is the number of years after 2010, x > 7 corresponds to years after 2017.

Solve. -Using Data from 2010-2012, the Annual Number of Cars Sold