haha thanks mate, the rest is putting in the values in h formula, and it leads to answer, im sttill having some struggle with the Q1.
Substitution is the word u suggested, after looking up in the book (few chapters back) i came to the idea of bringing all x'és or y'es
to one site and start from there.
Let me work it out:
Y= x
Y = 2x -5
using the substitution
x=y
2x=-y-5
x=-1/2y-5/2
Then substituting right? I dont know what to do man