what does it mean when they say tell wheather the equation represents direct variation. if so then give the constant of variaton

Question

the problem is:
2y-5x=0

Answer 1

y= 5x/2 So as x doubles, so does y. That is a direct variation.

The constant here is 5/2

Answer 2

so it is just the slope of the line??

Answer 3

yes.

Answer 4

alrigth thanks