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1) 3x - 2y = 9 (3)
2) x + 3y = - 7 (2)
9x - 6y = 27
2x + 6y = - 14
------------------
11x + 0y = 13
11x = 13
x = 13/11
Reemplazo el valor de x en ecuación 2.
x + 3y = - 7
13/11 + 3y = - 7
13 + 11 * 3y
--------------- = - 7
11
13 + 33y
------------ = - 7
11
33y + 13 = - 77
33y = - 77 - 13
33y = - 90
y = -90/33
y = -30/11
Solución :
x = 13/11
y = -30/11