book Maths Puzzle Numerical Ability

F(x)=x/(x+1)then
f(x-1)=

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book Other Question

How do you solve this by graphing?

3y=3x-6
9=8x-9y I need help on this equation:

y=[x+3]-4=

I need the x-intercepts(the negative and positive).....im stuck at that part..

Thanks