Question

y varies inversely as twice x. When x = 9, y = 2. Find y when x =

Answer 1

"y varies inversely as twice x" means that y = k/(2x)


y = k/(2x)


2 = k/(2(9))


2 = k/18


2*18 = k


36 = k


k = 36


---------------------


y = k/(2x)


y = 36/(2x)


y = 18/x


So the equation is y = 18/x