x is
directly proportional to y. x=12 while y=4. Find y when x is 69.
Solution
x ⍺ y
x = ky
12 = k x 4
12 = 4k
4 4
k = 3
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k = 3, y= ?
x = 69.
69 = 3 x y
69 = 3y
3 3
y
= 23.
TRY THIS…………….
x is
directly proportional to y. x=20 while y=5. Find y when x is 68.
Ans. y=17
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