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2x-11 = 4y +7 ec. 2
de la ec. 1:
3x+2y = 5+6
3x+2y = 11 ec. 3
de la ec. 2:
2x-4y = 7+11
2x-4y =18 ec. 4
si multiplicamos por 2 la ec. 3 y la sumamos a la ec. 4
6x +4y = 22
2x -4y = 18
8x = 40
x = 40/8
x = 5
el valor de x es 5
de la ec. 4:
2x-4y = 18
2*5 -4y = 18
10-4y = 18
-4y = 18-10
-4y = 8
y = 8/-4
y = -2
El valor de y = -2
Comprobémoslo:
ec. 1:
3x-6 = 5-2y
3*5 - 6 = 5 - 2*-2
15-6 = 5+4
9 = 9 comprobado.
ec. 2:
2x-11 = 4y+7
2*5-11 = 4*-2 + 7
10-11 = -8 + 7
-1 = -1 comprobado
Saludos....