book Maths Puzzle Numerical Ability

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

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book Other Question

(x+5)/(x-4)<=0 Im working on Quadratic Functions, I need to know how to graph Parabolas. could u solve
y=2xsqaured+4x-1
and
y=2xsquared+4x-5
and
y+x2+3x