Answer:
Direct relationships have a clear cause and effect and are fairly "equal".
The farther I drive, the longer the time on the road.
If I drive 10 hours, I will have traveled some distance.
Inverse relationships require understanding because they are not "equal" and seem to challenge logic or reasoning. i.e. You have to stop and think about it.
The farther I drive, the less time it takes me to reach my destination.
The more Sodium (salt) a body ingests, the lower the Potassium will go.
Some hormones also have an inverse relationship: when one is lower, the other is higher.