1. -4x-2y=-12      4x+8y=-24 2. x-y=11     2x+y=19 3. -2x-9y=25     -4x-9y=-23

1. -4x-2y=-12
     4x+8y=-24
2. x-y=11
    2x+y=19
3. -2x-9y=25
    -4x-9y=-23

1. -4x-2y=-12
     4x+8y=-24
2. x-y=11
    2x+y=19
3. -2x-9y=25
    -4x-9y=-23
4. 8x+y=-16
    -3x+y=-5

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