VARIATION 2

x is directly proportional to y. x=12 while y=4. Find y when x is 600.

Solution

x ⍺ y

x = ky

12 = k x 4

12 = 4k

4      4

k = 3

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

k = 3, y= ? x = 600.

600 = 3 x y

600  = 3y       (dividing by 3 on both sides)

 3        3

Hence y = 200 answer.

TRY THIS…………….

x is directly proportional to y. x=20 while y=4. Find y when x is 70.