Are these equations Direct variations, Inverse Variations, or neither?
1) y= x-4
2) xy= -0.25
3) xy = 5
4) y/2=x
5) x+y =10
6) 6x=y

Acontainer full of water weighs 15.5 lbs. when ¼ of the water is poured out, the container now weighs 12 ½ lbs. how much does the container weigh when empty?