Tuesday, 28 March 2017

VARIATIONS 1


x is inversely proportional to y. x=18 while y=5. Find y when x is 15.

Solution

x k
      y

x = k
      y

18 = k
        5

k = 18 x 5

k = 90

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

k = 90, y= ?, x = 15.

x = k
      y

15 = 90
         y

y x 15 = 90  x  y   (multiply by y on both sides)
                y


15y = 90
15      15

Hence y = 6  .


TRY THIS…………….



x is inversely proportional to y. x=80 while y=4. Find y when x is 10. 

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