mechanics questions

hello

Could somebody expalin to me how to work out question 3i of this paper
see link to paper below

http://www.mei.org.uk/files/papers/2011_June_m1.pdf

what are the general rules when working out questions like that?




I would also need help with
the mei jun09 paper question 2iii
im really stuck ....


http://www.mei.org.uk/files/papers/m109ju_livn.pdf



and i dont really get 4ii) in jun06
"deduce that...."


http://www.mei.org.uk/files/papers/m106ju_hwi4.pdf




last but not least
jun08 2i) how do you draw the sketch


http://www.mei.org.uk/files/papers/m108ju_vik3.pdf

thanks

Question 3(i). Force F is and Force G is . Given that F and G act in parallel lines, find y and z.

Since F and G lie on parallel lines, they are proportional to each other, i.e., there is a number k such that -2k = -6, 3k = y and -4k = z.