Question

If x and y are in inverse proportional and x=15 when y=6. Find y when x=9

Answer 1

let us consider x=k/y
x=15 when y=6
x=k/y
=> 15=k/6
=>k=90
so when x=9 then y =
x=k/y
=>9=90/y
=>y=90/9
=>y=10
so the value of y is10

Answer 2

Step-by-step explanation:

Use the inverse proportion

Let the y be a when the x = 9

x y

15 6

9 a

:- The x and y are in inverse proportion

=> 15/9 = 6/a

=> 15/9 = a/6

=> 9 × a = 15 × 6

=> a = 15 × 6/9