Find the range y = (5-x) of (3x-9) (6 ≤ x ≤ 7) How to draw a picture? Or tell me how to turn the above formula into a general inverse proportion formula, such as (x + #)#+#

Find the range y = (5-x) of (3x-9) (6 ≤ x ≤ 7) How to draw a picture? Or tell me how to turn the above formula into a general inverse proportion formula, such as (x + #)#+#

Let t = 5-x
x=5-t
y=(6-3t)/t
y=6/t -3