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1 → { -10x - 5y = 0
2 → { 21x - 7y = 28
Despejando la variable " y " de la ecuaciones " 1 " :
-10x - 5y = 0
5y = -10x
y = 10x/5
y = -2x
Reemplazando en la ecuacion " 2 " :
21x - 7. ( - 2x ) = 28
21x + 14x = 28
35x = 28
x = 28/35
x = 4/5
Reemplazando en la ecuacion " 1 " de la variable despejada " y " :
y = -2x
y = -2.4/5
y = -8/5
Solución → S = {( 4/5 , -8/5 )}