y = 9x + 55 because the 9x is the amount you get paid an hour, and to get to the 199 you need to include to rate at which you get paid, and add that to how much you already have saved.
9x + 55
y=number hours you need to work
199-9y + 55= how much money you need
9y + 55 is how many hours you need to work.
hope it helps :)
7.7m questions
10.3m answers