Select each option that represents a proportional relationship between x y

We're having a hard time selecting anything, because

you won't let us see what the options are.

Any option that looks like

x = K y

or

y = K x

or

A x = K y

or

A y = K x

or

A x - K y = 0

or

A y - K x = 0

is a proportional relationship between 'x' and 'y'.

The 'A' and 'K' can be any number except zero.