Question

If y varies inversely as x and y = 3 when x = 5, find x when y = 2.5

Answer 1

y = k/x
k = xy

y = 3 when x = 5

k = 3*5
k = 15

y = 15/x or x = 15/y

find x when y = 2.5
x = 15/y
x = 15/2.5
x = 6 (ANSWER)