ok
i got same thing for 7a)
but when i did that thing on graph, my answer is completely different.
try it out in ur pc only without printing
that is :@
it is (46.5 in markscheme) how the f***?
in 8a
i understood
but i had one quesiton
when do the thing we did below and when do we actually substitute?
i am little confused with that.