Resposta:
[tex]\left \{ {{x+y=2} \atop {x-y=-6}} \right. \\\\2x = -4\\\\x=\frac{-4}{2}\\\\x=-2\\\\x+y=2\\-2+y=2\\y=2+2\\y=4\\\\(x,y) = (-2,4)[/tex]
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Resposta:
[tex]\left \{ {{x+y=2} \atop {x-y=-6}} \right. \\\\2x = -4\\\\x=\frac{-4}{2}\\\\x=-2\\\\x+y=2\\-2+y=2\\y=2+2\\y=4\\\\(x,y) = (-2,4)[/tex]