VARIATION K2

 x is inversely proportional to y. x=12 while y=20. Find y when x is 15.

 

Solution

 

x ⍺ k

     y

 

x = k

     y

 

12 = k

      20

 

k = 12 x 20

 

k = 240

 

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

 

k = 240, y= ?, x = 15.

 

x = k

     y

 

15 = 240

        y

 

y x 15 = 240  x  y   (multiply by y on both sides)

              y

 

15y = 240

15     15

 

y = 16 .

 

TRY THIS…………….

 

x is inversely proportional to y. x=12 while y=40. Find y when x is 15.