If x varies inversely as y and y = 60 when x = 1.5, find x when y = 4.5.
If x varies inversely as y
∴ xy = k (constant)
If x = 1.5 and y = 60
∴ 
⇒ k = 90
When y = 4.5, then from Eq.(i),
45× y = k
⇒ 45 × y = 90
⇒ 
20
66
If x varies inversely as y and y = 60 when x = 1.5, find x when y = 4.5.
If x varies inversely as y
∴ xy = k (constant)
If x = 1.5 and y = 60
∴
⇒ k = 90
When y = 4.5, then from Eq.(i),
45× y = k
⇒ 45 × y = 90
⇒ 20