A table contains the pairs (3, 12), (7, 28), and (11, 44). Which additional pair keeps y directly proportional to x?

توضیح

Every existing pair has y divided by x equal to 4, and 36 divided by 9 is also 4, so the added pair preserves the relationship. The pair 9 to 34 is tempting because both values are close, but its quotient is not 4.