x
is inversely proportional to y. x=18 while y=5. Find y when x is 15.
Solution
x
⍺ k
y
x
= k
y
18
= k
5
k
= 18 x 5
k
= 90
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k
= 90, y= ?, x = 15.
x
= k
y
15
= 90
y
y
x 15 = 90 x y (multiply by y on both
sides)
15y = 90
15
15
Hence y = 6 .
TRY THIS…………….
x
is inversely proportional to y. x=80 while y=4. Find y when x is 10.
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