Sec 3/4 E Math T05-Q07 - Applying inverse proportion to a graph

Sec 3/4 E Math T05-Q07 - Applying inverse proportion to a graph

Secondary 3
Original parallel to Sec3&4 E Math FA

The variables \(x\) and \(y\) are related by \(y=\dfrac{k}{x}\). The graph passes through \(( 5,6)\).

  1. Find the value of \(k\).
  2. Find \(y\) when \(x=7\).
  3. State the effect on \(y\) when \(x\) is doubled.

Solution:

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Answer:(a) \(k=30\); (b) \(y=4.29\); (c) \(y\) is halved.

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