DIRECT VARIATION F1

x is directly proportional to y. x=12 while y=4. Find y when x is 93.

 

Solution

 

x ⍺ y

x = ky

 

12 = k x 4

 

12 = 4k

4      4

 

k = 3

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

 

k = 3, y= ? x = 93.

 

93 = 3 x y

93 = 3y

3      3

 

y = 31.

 

TRY THIS…………….

 

x is directly proportional to y. x=20 while y=5. Find y when x is 100.

 

Ans. y=25