Question

determine o valor de x e y do sistema 2x+y=-4
x+3y=-2

Answer 1

2x + y = -4
x + 3y = -2    .(-2)
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2x + y = -4      →  2x + 0 = - 4
-2x - 6y = 4           2x = - 4
-----------------          x = -4/2
       -5y = 0             x = -2
         y = 0