VARIATIONS 1

x is inversely proportional to y. x=12 while y=20. Find y when x is 4.

Solution

x ⍺ k

      y

x = k

      y

12 = k

        20

k = 20 x 12

k = 240

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

k = 240, y= ?, x = 4.

x = k

      y

4 = 240

        y

y x 4 = 240  x  y   (multiply by y on both sides)

              y

4y = 240

4      4

y = 60.

TRY THIS…………….

x is inversely proportional to y. x=200 while y=4. Find y when x is 80.