Hello! I am on a test and I am having serious trouble with this problem, Think you can answer it? Thanks a billion!

Which of these equasions doesn't represent a direct proportion?
[Note: 1/2 is how ill be writing fractions!]
A, 3/4Y = 6X
B, Y = 9/X
C, Y/X = 5
D, 2Y = X

Only answer if you have the answer please!

2 answers

y = 9 / x
is the same as
x y = 9
That is not of the form y = constant * x
AGAIN?