Question

Find the constant of variation k for the inverse variation. Then write an equation for the inverse variation.
y = 5 when x = 7.5

Answer 1

An inverse equation follows the formula

y=kxYou're given y=5 ,
 x=7.5 plug these values into your equation.
5=k7.5
solve for k.
k=5(7.5)k=37.5
rewrite equation y=37.5x
and now we can check to see if our values are correct
5=37.5/7.5
=5 

Hope this helps

Answer 2

Answer:  The required constant of inverse variation is 37.5 and equation for the inverse variation is $yx=37.5.$

Step-by-step explanation:  We are given to find the constant of inverse variation and to write an equation for the following inverse variation :

y = 5  when  x = 7.5.

Let k denote the constant of inverse variation.

According to the given information, we can write

$y\propto\dfrac{1}{x}\\\\\\\Rightarrow y=\dfrac{k}{x}~~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{k is the constant of inverse variation}]\\\\\Rightarrow yx=k~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

When y = 5, x= 7.5, then from equation (i), we get

$5\times7.5=k\\\\\Rightarrow k=37.5.$

Substituting the value of k in equation (i), we arrive at

$yx=37.5.$

Thus, the required constant of inverse variation is 37.5 and equation for the inverse variation is $yx=37.5.$