book Maths Puzzle Numerical Ability

The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle

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how do i solve using a graph for these types of problems? x^3-1=2x^2-3x
or y=2x+10-x^2 I was womdering if you could explain how to answer 3 problems:

1) x^2+x>0

2) x+3<-2/x

3) y=x^2+4x+1

Please explain each step so that I can use these are sample and model problems.

Thanks,

Char