Hi everyone, lately I have attempted to do a simple Simultaneous equations problem and it has stumped me for 2 days. Here is the problem:

(i)

(ii)

I have attempted to solve this problem in 18 ways and they lead to different answer however non of them are correct (Correct answer: R=3, S=1/2 -Back of the book). Here is one of the attempts:

(i)

(iii)

(ii)

(iv)

(iv)

(v)

(iii - v)

If someone could explain to me how to do this, I would be really grateful because I'm starting to pull my hair out over this problem I think I'm doing something wrong with the numerators.