x
is directly proportional to y. x=12 while y=4. Find y when x is 240.
Solution
x ⍺ y
x =
ky
12
= k x 4
12 = 4k
4 4
k =
3
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k =
3, y= ? x = 240.
x =
ky
240
= 3 x y
240 = 3y
3
3
y = 80.
TRY THIS…………….
x
is directly proportional to y. x=20 while y=8. Find y when x is 200.
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