book Maths Puzzle Numerical Ability

Solve the equasions x+4=-1: 5b=-25: 3x+4=13: 5(x-2)=15: x+8=3(x-4)i tried 4+1=5is it right

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how do you tell with an equation if a line is parallel or perpendicular? how do solve by graphing: x+y=-1
3x-y=-7