VARIATIONS 1

x is inversely proportional to y. x=14 while y=5. Find y when x is 7.

Solution

x ⍺ k

      y

x = k

      y

14 = k

        5

k = 14 x 5

k = 70

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k = 70, y= ?, x = 7.

x = k

      y

7 = 70

       y

y x 7 = 70  x  y   (multiply by y on both sides)

             y

7y = 70

7y = 70        (dividing by 7 on both sides)

7      7

y = 10

TRY THIS…………….

x is inversely proportional to y. x=80 while y=4. Find y when x is 16.