Equation: 200+12y=644
# of albums sold:37
Since Floyd earned 644, and we know he earns 200$ a month, we can subtract, 644-200, which gives us 444$, we just divide by 12 to find out how many albums he needed to sell to get 444$. which is 37. We can check this by simply multiplying 12x47=444. Therefore Floyd madde 37 albums.
