What is the ratio of x = y, 9, X and Y. y = x + 7, X and y? Why?

What is the ratio of x = y, 9, X and Y. y = x + 7, X and y? Why?

The first is the inverse ratio, X / 7 = 9 / y
x=7*9/y
x=63/y
So it's inversely proportional
The second is a linear function

If x = 2Y of 5, X is proportional to y; if x multiplied by y = 4 of 9, X is proportional to y; if X-Y = 20, X is proportional to y

If x = 5 / 2Y, X is proportional to y; if x multiplied by y = 9 / 4, X is proportional to y; if X-Y = 20, X is not proportional to y

8 of x = 2 of Y, X is proportional to y. 3 of x = y, X is proportional to y
The bottom area of the cylinder is fixed, and the volume is proportional to the height
House area is fixed, the number of floor tiles required is proportional to the area of each floor tile
The circumference of a rectangle is fixed, and the length and width are proportional

8 of x = 2 of Y, X and y are in (inverse) proportion. 3 of x = y, X and y are in (positive) proportion
The bottom area of the cylinder is fixed, and the volume and height are in inverse proportion
House area is fixed, the number of tiles required and the area of each tile (inverse) proportion
A rectangle has a definite circumference, and its length is not proportional to its width