Answer:
3x+2y=-6
4x-7y = -8
per combination
-7(3x+2y=-6)
-2(4x-7y=-8)
-21x-14y=42
-8x+14y=16
-29x=58
x=58/-29=-2
we calculate y:
3*-2+2y=-6
-6+2y=-6
2y=-6+6
y=0
S{-2;0}
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