VARIATION 1

x is inversely proportional to y. x=18 while y=5. Find y when x is 6.

Solution

x⍺k

    y

x = k

      y

18 = k

        5

k = 18 x 5

k = 90

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

k = 90, y= ?, x = 6.

x = k

      y

6 = 90

         y

y x 6 = 90  x  y   (multiply by y on both sides)

                y

6y = 90

6       6

y = 15 .

TRY THIS…………….

x is inversely proportional to y. x=48 while y=4. Find y when x is 8.