Question

if x and y vary inversely and x= 25, when y= 3. Find y, when x=15

Answer 1

The answer is 5.
X=1/y*k
K is a constant.
So, xy=k
So,25*3=k=75
Now, x is 15 &k is 75.
So, 15*y=75
Hence y is 75/15=5
Y=5

Answer 2

Answer:

The value of y=5 when x=15.

Step-by-step explanation:

Given : If x and y vary inversely and x= 25, when y= 3.

To Find : The value of y, when x=15?

Solution :

As x and y vary inversely proportional which means

$x\propto \frac{1}{y}$

$x=\frac{k}{y}$

Where, k is inversely proportional constant

So, $xy=k$

Now, Substituting x=25 and y=3

$(25)(3)=k$

$k=75$

Put back in the equation,

$xy=75$

Now, Put x=15

$15y=75$

$y=\frac{75}{15}$

$y=5$

Therefore, The value of y=5 when x=15.