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1 → { 2x + y = 8
2 → { x + 2y = 4
Despejamos la variable " y " de la ecuacion " 1 " :
2x + y = 8
y = 8 - 2x
Reemplazamos en la ecuacion " 2 " :
x + 2 ( 8 - 2x ) = 4
x + 16 - 4x = 4
x - 4x = 4 - 16
- 3x = - 12
x = -12/ - 3
x = 4
Reemplazamos en la ecuacion " 1 " de la variable despejada " y " :
y = 8 - 2x
y = 8 - 2.4
y = 0
Solucion : S = {( 4 , 0 )}
x → 4
y → 0