Select all equations that show a direct variation relationship.
Group of answer choices
8x−2y=2
y=−25x
xy=40
y3=x
y = k x
if k = -25
then
y = -25 x
The others can not be put in y = k x form
Group of answer choices
8x−2y=2
y=−25x
xy=40
y3=x
if k = -25
then
y = -25 x
The others can not be put in y = k x form