Wednesday, 9 August 2017

VARIATIONS 2


x is directly proportional to y. x=12 while y=4. Find y when x is 69.

Solution

x y

x = ky

12 = k x 4

12 = 4k
4      4

k = 3
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

k = 3, y= ? x = 69.

69 = 3 x y
69 = 3y
3      3

y = 23.

TRY THIS…………….

x is directly proportional to y. x=20 while y=5. Find y when x is 68.


Ans. y=17

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