How do I get an X & Y position relative to an object.

I'm trying to figure out how to get a value.

I have an object at position X 100 . Y 100

and another object 20 pixels above and 30 pixels to the left. X 70 . Y 80

How do i get the relative value of -30 and -20 from these two?

I want to return the difference between two XY positions.

Just can't figure it out.

Sprite1.X-(Sprite1.X-Sprite2.X)?

relativePositionX = object.x - anotherObject.x

relativePositionY = object.y - anotherObject.y

If you want distance then relativeDistance = distance(object.x,object.y,anotherObject.x,anotherObject.y)