exam Maths Puzzle Numerical Ability

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Graph x-4y=2.

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I need to find x and y ranges for the following problems and then graph accordingly. I need very detailed information and step by step help, if you can. I need to understand this. THANK YOU!!!
1. f(y)=-5y+3 2. f(x)=x^2-2x+1 Solve each of the following systems by substitution.
5x - 2y= -5
y - 5x = 3

8x - 4y = 16
y = 2x - 4

4x - 12y = 5
-x + 3y= -1