solve each system by the equation:

1.-x-5y=-19
y=-6x-2

2.3x+7y=24
y=6

3.-x-6y=-2
y=4x+17

4.-5x+y=-2
-4x+6y=-12

5.2x+y=8
4x-y=-8

6.-6x+4y=2
x+y=-7