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2) 3x + 4y = - 1 (-2)
8x + 8y = 4
-6x - 4y = 2
-----------------
2x + 0y = 6
2x = 6
x = 6/2
x = 3
Reemplazo x = 3 en ecuación 1.
2x + 2y = 1
2 (3) + 2y = 1
6 + 2y = 1
2y = 1 - 6
2y = - 5
y = -5/2
Solución :
x = 3
y = -5/2