Question

If x varies inversely as y, and x = 7 when
y=3, find y when x = 9.

Answer 1

3.85714285714

Explanation:

7 = 3

9 = y

9*3=27

27/7 = 3.85714285714

Answer 2

Explanation:

x=k/y------(1)

k=xy

k= 7×3

k=21

from equation 1

x=k/y

y=k/x

y=21/9

y = 2.33