Which of the following represents a nonlinear equation?
a) y = 3x + 3
b) y = -3x
c) y = 1/3x + 3
d) y = 3/x

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.