For Q23, basically, you need to re-arrange the given equation so that on one side you have ln x. Then, whatever appears on the other side forms the equation of the second line you need to plot. By observation, we see a x2 term on the left. When you apply natural log, you get 2(ln x).

Note that the question does not require you to show the graph. The graph is shown here just to help you understand the concept.

For Q24, generally, to solve power equations, you need to apply log or ln.