Both x and y vary directly with each other and when x is 10, y is 14, which of the following is not a possible pair of corresponding values of x and y?

Both x and y vary directly with each other.

i.e. x

if x = 10 and y = 14

so, 10 14 or 5 7

This proportion is not follow in option (b) pairs.

Hence, Option(b) is correct.