Which expression is the result of solving the equation ax-b=cy for x? (For a not to equal 0)

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition? a) 6 b) 8 c) 14 d) 20

15 points ! ~ see if you know the answer to both you!

Answer question above and explain each step : )