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(2) 3X - 5Y = 11
La primera la multiplico por 3:
(1)x3: 3X + 18Y = -12
La segunda la multiplico por -1:
(2)x-1: -3X + 5Y = -11
(1)x3: 3X + 18Y = -12
+ (2)x-1: -3X + 5Y = -11
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23Y = -23
Y = -23/23
Y = -1
Ahora puedo reemplazar el valor de Y = -1, en 3X - 5Y = 11
3X - 5(-1) = 11
3X + 5 = 11
3X = 11 - 5
3X = 6
X = 6/3
X = 2
Rta: X = 2; Y = -1