You win a prize and are offered two choices. Which of the choices could be represented by a linear equation? Choice A: $20 on January 1, $60 on February 1, $180 on March 1, $540 on April 1, and so on, with the amount tripling each month.

Choice B: $100 the first month, $300 the second month, $500 the third month, and so on, with $200 added each month.

answer choices:
Choice A
Choice B
Not enough information is given
Neither is linear