Resposta: A)
[tex]\left \{ {{x+y= -2} \atop {2x-y=26}} \right. \\3x=24\\x= \frac{24}{3} \\x=8 \\\\x+y=-2\\8+y=-2\\y=-2+8\\y=4\\\\\\resposta: x=8 e y=4[/tex]
B)[tex]\left \{ {{x+7y=-2} \atop {-x-4x=-1}} \right. \\ \\-4x=-3\\x= -\frac{3}{4} \\\\x+7y=-2 \\-\frac{3}{4} +7y=-2\\7y= -2-\frac{3}{4} \\7y=-\frac{11}{4} \\y=\frac{-\frac{11}{4} }{7}\\ \\y=-\frac{11}{28}[/tex]
Explicação passo a passo: Desculpe a demora.
