x is inversely proportional to y. x=18 while y=5. Find y when x is 10.
Solution
x ⍺ k
y
x = k
y
18 = k
5
k = 18 x 5
k = 90
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k = 90, y= ?, x = 10.
x = k
y
10 = 90
y
y x 10 = 90
x y (multiply by y on both sides)
10y = 90 (dividing by 10 on both sides)
10
10
Hence y = 9.
TRY THIS…………….
x is inversely proportional to y. x=80 while y=4. Find y when x is 20.
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