2023 SJI P1 Q3

2023 SJI P1 Q3

IB Year 5 | Grade 11
7 marks

A curve with equation \(y=\mathrm f(x)\) undergoes the following sequence of transformations.

A: A translation by \(\begin{pmatrix}-2\\1\end{pmatrix}\).

B: A reflection in the \(x\)-axis.

C: A horizontal stretch with scale factor \(\dfrac13\).

The resulting curve has equation \(y=\dfrac1{x-2}\).

  1. Find an expression for \(\mathrm f(x)\).[4]
  2. Sketch the graph of \(y=\dfrac1{x-2}\), indicating clearly the axial intercept and the equations of the asymptotes.[3]

Solution:

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Answer:(a) \(\mathrm f(x)=\dfrac3{8-x}-1\) (b) Intercept \((0,-\dfrac12)\); asymptotes \(x=2,y=0\).

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