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[1] x + y = -12
[2] xy = 35
x = 35/y
Reemplazando [2] en [1]
35/y + y = -12
(35 + y²)/y = -12
35 + y² = -12y
y² + 12y + 35
(y + 7)(y + 5)
y= -7 y = -5
Si y=-7, reemplazando en [1]
x + y = -12
x - 7 = -12
x = -12 + 7 = -5
Solucion1: x = -5, y = -7
Si y=-5, reemplazando en [1]
x + y = -12
x -5 = -12
x = -12 + 5 =-7
Solucion2: x = -7, y = -5