Question

Find x when y=5 if y varies inversely as x and x=6 when y =-18

Answer 1

It has been given that y varies inversely with x, therefore the equation for this relationship is as follows;
y =$\frac{k}{x}$\
when y = -18 and x = 6
-18 = k/ 6 ---1)
We need to find x when y = 5
 5 = k/x
when we divide 1)/2), k gets cancelled 

$\frac{-18}{5}= \frac{x}{6}$
x = -18*6/5
x = -21.6
when y = 5, then x = -21.6