Question

x – 3y = 1
2x + 3y = 8

Answer 1

Respuesta:

x – 3y = 1         ==> x = 1 + 3y

2x + 3y = 8

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Reemplazamos:

2(1 + 3y) + 3y = 8

2 + 6y + 3y = 8

9y = 6

 y = 6/9 ==> 2/3

Hallamos "x":

x = 1 + 3(2/3)

x = 1 + 2

x = 3