book Maths Puzzle Numerical Ability

Hi I'm not sure if I picked the right topic but I am trying to solve the following system of linear inequalities graphically. The problem is
3x-y is less than or equl to 6
x is

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book Other Question

I need to know what a "scale factor" is. (i;m in basic geometry in school) and not sure of what the scale factor means. Simplify: Thank you for your help.

[3/(x-1)]+3 / [3/(x+1)]-3

Thank you