How to graph X given Y

Example 1: Volume of revolution in 2017 alevel P2 4b

2017 P2 4b

Let a=2 so we can visualise the shape of the graph

IMG_8197IMG_81982017 P2 4b 1

Example 2: Solution curve for Differential equation. 2014 alevel P1

2014 P1

This is solution for part iv.

2014 P1a

It can be sketched without expressing the solution in the form x=f(t)IMG_8196IMG_8195

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