As you can see from the line chart attached below, the red line has a down-then-up pattern while the purple and orange's pattern is up-then-down. Is it correct to say the red line has a reverse pattern to the other two's? Or inverse is the appropriate word here? If you're kind enough please recommend another better way/word to describe this difference. Thank you!
One (of the values being plotted) has an inverse relationship with the other.
They (the values) are inversely related. They are opposite one another. They have an opposite relationship.
That is to say as one increases, the other decreases. The relationship can be a close one or a loose one depending on how mathematically precise they (the data being compared) coincide.
You cannot say they are "inversely variable" which suggests a precise mathematical relationship. Rather, you are suggesting a general relationship.
A relationship between two variables in which the product is a constant. When one variable increases the other decreases in proportion so that the product is unchanged.
The red line shows an inverse relationship to the other two lines. (It's in opposition to the other two lines.)
If they reflected each other, you would say they have a direct relationship with each other. They (the values being plotted) are directly related. They are similar to one another.
The purple and orange plots have a direct relationship with each other. (They are in agreement with each other.) They have a similar relationship.
Good luck with your writing.