Question

Which does not show a direct variation between x and y?
A. y=5x
B. y=6/x
C. y=0.7x
D. y=x/9

Answer 1

I'm not sure if this is the same question as: Which is y not proportional to x

However they all (except for one) have a similarity that y = kx

where k is a constant

which one does not follow the format of y = kx?

Answer 2

the direct variation has form \[y=kx,~~where~k~is~constant\]

Answer 3

\[y=\frac{ k }{ x }\] would not be a direct vatiation