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3x + 5y = 3
Despejando Y en ambas ecuaciones:
y = 25 - 2x
y = (3 - 3x)/5
Igualando ambas ecuaciones y = y
25 - 2x = (3 - 3x)/5
125 - 10x = 3 - 3x
125 - 3 = 10x - 3x
122 = 7x
x = 122/7
y = 25 - 2(122/7)
y = 25 - 244/7
y = (175 - 244)/7
y = -69/7
Respuesta: x = 122/7 ; y = -69/7