book Maths Puzzle Numerical Ability

(x+5)/(x-4)<=0

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book Other Question

Leo's garden, which is 6m wide, has the same area as Jen's garden, which is 8 m wide. Find the lengths of the two rectangular gardens if Leo's garden is 3m longer than Jen's garden My book does not go into much help with this problem:
If y = f(x)=5x+1 find each value and my book gives me f(2/5) Not much further instruction on this one. Any help would really be appreciated.
Thank you, Liz