Difference Between Graph Trends

In Physics I've learned a ton about graph trends. Our discussions were so detailed, I would always walk out at the end of class with my head hurting. But, confusion was leaving my brain, so I guess that's a good thing! 

   Here are the differences between the graph trends I learned-

• direct- when the x increases, y increases OR when x decreases, y decreases.

•direct proportional- constant rate of change between x and y. The graph is linear, with zero as the y intercept. When x doubles/ triples/ etc, then y doubles/triples/etc. 

•indirect- not direct, so when one variable increases, the other decreases. 

•inverse proportional- when x is doubled/ tripled/ etc., y is halved/ thirded/ exc. There is no y- intercept. The graph for this trend typically looks like a hyperbola. 

•inverse- as x increases, y decreases OR as x decreases, y increases. 

To make a trend proportional, the x and y values have to be increasing/ decreasing equally, at the same value. 

Can't wait to learn more!!