VARIATION 1

x is inversely proportional to y. x=12 while y=5. Find y when x is 3.

Solution

x ⍺ k

      y

x = k

      y

12 = k

        5

k = 12 x 5

k = 60

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k = 60, y= ?, x = 3.

x = k

      y

3 = 60

       y

y x 3 = 60  x  y   (multiply by y on both sides)

             y

3y = 60

3y = 60        (dividing by 3 on both sides)

3      3

y = 20

TRY THIS…………….

x is inversely proportional to y. x=20 while y=4. Find y when x is 16.