# If y varies inversely as x and y = 28 when x = 4, then how do you find k, the constant of proportionality?

Jun 4, 2018

$k = 112$ and variation equation is $x y = 112$
y prop 1/x or y = k* 1/x or x y= k ; k is called proportionality
constant.  x y= k ; y=28 ,x= 4 :. k= x*y=28*4
or $k = 112$ .The variation equation is $x y = 112$ [Ans]