Question

if x varies directly as y² and x=4 when y=5, then find x when y is 15​

Answer 1

Answer:

given X is directly proportional to y²

i.e.x=ky²,where K is constant of proportionality

now given X=4when. y=5 so

4=k5²

K=4/25

now to find X when y is 15

X=4/25*15²

X=36 ans

Step-by-step explanation:

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Answer 2

Given : x varies directly as y²  

x=4 when y=5

To Find : x when y is 15​

Solution:

x varies directly as y²  

=> x  ∝ y²

=> x = ky²

x=4 when y=5

=> 4 = k (5)²

=> k = 4/25

x = ky²

=> x = 4y²/25

y is 15​

=> x = 4(15)²/25

=> x = 4 (9)

=> x = 36

Hence x = 36 when y = 15

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