book Maths Puzzle Numerical Ability

please simplify and solve
1. 4x+y=2
x+2y=4
2. -x-5y=-6
3x+y=4
3. -3x+2y=7
x+y=-7
4.2x+3y=5
-x+2y=1
5.-x+2y=-6
4x-3y=4
6.4x+y=-6
3x-2y=1

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