VARIATION 1

x is inversely proportional to y. x=12 while y=5. Find y when x is 20.

Solution

x ⍺ k

      y

x = k

      y

12 = k

        5

k = 12 x 5

k = 60

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k = 60, y= ?, x = 20.

x = k

      y

20 = 60

         y

y x 20 = 60  x  y   (multiply by y on both sides)

                y

20y = 60

20      20

y = 3  .

TRY THIS…………….

x is inversely proportional to y. x=20 while y=4. Find y when x is 10.