Friday 2 March 2018

VARIATIONS 1


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.

x = ky

69 = 3 x y
69 = 3y
3      3

y = 23.


TRY THIS…………….


x is directly proportional to y. x=28 while y=4. Find y when x is 70.

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