Joint direct variation

Joint direct variation

Secondary 2
TGM Original Questions

The quantity \(A\) varies directly with \(l\) and \(h\), so \(A=klh\). Given \(A=90\) when \(l=5,h=3\):

  1. express \(A\) in terms of \(l,h\)
  2. find \(l\) when \(A=504,h=7\).

Solution:

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Answer:(a) \(A=6lh\); (b) \(l=12\).

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