VARIATION J1

 

x is directly proportional to y. x=32 while y=4. Find y when x is 816.

 

Solution

 

x ⍺ y

x = ky

 

32 = k x 4

 

32 = 4k    [dividing by 4 both sides]

4      4

 

k = 8

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

 

k = 8, y= ? x = 816.

 

x = ky

 

816 = 8 x y

 

816 = 8y

8        8

 

y = 104.

 

TRY THIS…………….

 

x is directly proportional to y. x=40 while y=4. Find y when x is 370.