Toby collects data and makes a bar graph about his classmates' pets. he finds that 9 classmates have dogs, 2 classmates gave fish, 6 classmates have cats, and 3 classmates have gerbils. what pet will have the longest bar on the bar graph?

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.