exam Maths Puzzle Numerical Ability

I have to graph these equations.I have to linear and non linear equation.

1.y=5x^-2

2.3x-1=5x-y

3.y=|x|+3

4.x+2=2x-1

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Factor x^2+(x-y)^2-2x*(x-y) Thank you, this question is not from text book (X-1)>=3