Sec 3/4 E Math Mock 1-Q11 - Mock Paper 1: Applying inverse proportion to a graph

Sec 3/4 E Math Mock 1-Q11 - Mock Paper 1: Applying inverse proportion to a graph

Secondary 3
2 marks
Original parallel to Sec3&4 E Math FA

The variables \(x\) and \(y\) are related by \(y=\dfrac{k}{x}\). The graph passes through \(( 7,6.857142857142857)\).

  1. Find the value of \(k\).[1]
  2. Find \(y\) when \(x=9\).[1]
  3. State the effect on \(y\) when \(x\) is doubled.

Solution:

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Answer:(a) \(k=48\); (b) \(y=5.33\); (c) \(y\) is halved.

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