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5x+2y=9
(3x-y=5)*2
5x+2y=9 ; sumamos ambas ecuaciones...
6x-2y=10
_______
11x=19
x=19/11
Como: 3x-y=5
3(19/11)-y=5
57/11-y=55/11
57/11-55/11=y
2/11=y
Rpta: x=19/11; y=2/11; C.S.=(19/11;2/11)
5x + 2y = 9
(3x - y = 5) x 2
5x + 2y = 9
6x - 2y = 10
11x = 19
x = 19/11
Entonces : 3x - y = 5
3 por 19/11 - y = 5
57/11 - y = 55/11
57/11 -55/11 = y
2/11 = y
Respuesta final : x = 19/11; y = 2/11