What is the value of y when x=9

2/3 = 9/y

cross multiply

2y = 9 * 3

2y = 27

y = 27/2

y = 13.5 or 13 1/2

Ok could be direcly proportional or inversely proprtional

directily proportional, is

x1/y1=x2/y2

where you are given x1, y1 and x2 or y2

inversely proprtional is

(x1) (y1) = (x2) (y2)

where yo are given x1, y2 and x2 or y2

directly

y1=2

x1=3

y2=?

x2=9

3/2=9/?

3?=18

?=6

y=6

inverse

y1=2

x1=3

y2=?

x2=9

(3) (2) = (9) (?)

6=9?

2/3=?

if directly proportional, y=6

if inversely proportion, y=2/3