Monday 9 October 2017

VARIATION 1


x is inversely proportional to y. x=30 while y=5. Find y when x is 15.

Solution

x k
      y

x = k
      y

30 = k
        5

k = 30 x 5

k = 150

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

k = 150, y= ?, x = 15.

x = k
      y

15 = 150
         y

y x 15 = 150  x  y   (multiply by y on both sides)
                y


15y = 150 10        dividing by 15 both sides
15      15

Hence y = 10  .


TRY THIS…………….



x is inversely proportional to y. x=80 while y=4. Find y when x is 40.

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