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x+y=-1
2x-y=16
2x - 2y = 16.... Ecua(1)
x - y = - 1.... Ecua(2)
Resolvemos.
Despejamos "x" en ambas ecuaciones.
2x + y = 16
2x = 16 - y
x = (16 - y)/2 ..... Ecua(1)
x - y = - 1
x = y - 1 .... Ecua(2).
Igualamos .
(16 - y)/2 = y - 1
16 - y = 2(y - 1)
16 - y = 2y - 2
18 = 3y
6 = y
Reemplazamos.
x - y = - 1
x - 6 = - 1
x = 5
Respuesta.
C.S { 5 ; 6}