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Combined direct and inverse variation

Combined direct and inverse variation

Secondary 2
4 marks
TGM Original Questions

Optional extension

The quantity \(V\) is directly proportional to \(u\) and inversely proportional to \(f\). When \(u=2,f=5\), \(V=8\).

  1. Express \(V\) in terms of \(u,f\).[2]
  2. Find \(u\) when \(f=4,V=15\).[2]

Solution:

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Answer:(a) \(V=\dfrac{20u}{f}\) (b) \(u=3\).

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