Substitution an Linearisation

[maxride]

I am very stuck on how to start this work so please help me out.

Please take a look at the attached file.

Thank you in advance x

 

[stapel]

I am very stuck on how to start this work so please help me out.

Please take a look at the attached file.

The text in the image is too small to read. Kindly please reply with the typed-out text, along with a clear listing of your thoughts and efforts so far. (Or, if you have no idea what they're talking about, please provide recent topics of study, so we can try to find online lessons so you can get caught up with the course material.)

Thank you!