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1) x + y = 1 (3)
2) 3x + 4y = 4 (-1)
3x + 3y = 3
-3x - 4y = - 4
----------------
0x - y = - 1
y = 1
Reemplazo y = 1 en ecuación 2.
3x + 4y = 4
3x + 4 (1) = 4
3x + 4 = 4
3x = 4 - 4
3x = 0
x = 0/3
x = 0
Solución :
y = 1
x = 0