Question

If xay² and y=3 when x=9 ; if x=25 then the positive value of y is

Answer 1

Answer:

y=5

Step-by-step explanation:

this is the right

answer

Answer 2

SOLUTION

GIVEN

x ∝ y² and y = 3 when x = 9

TO DETERMINE

The positive value of y when x = 25

EVALUATION

Here it is given that

x ∝ y²

⇒ x = ky² - - - - - - - (1)

y = 3 when x = 9 gives

9 = 9k

⇒ k = 1

From Equation 1 we get

x = y²

Now for x = 25 we have

25 = y²

⇒ y = ± 5

Since y is positive

This gives y = 5

FINAL ANSWER

Hence the required value of y = 5

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