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5x +15 y - 7x -8y = -6
-2x +7y= -6
7x -9y -2 (x-18y)= 0
7x - 9y -2x + 36y= 0
5x + 27y= 0
-2x+7y= -6
5x +27y=0
1) Despejaremos la X de las ecuaciones.
-2x= -6 -7y
x=
5x + 27y=0
5x= -27y
x=
2) Igualamos:
-5(-6-7y) = 2(27y)
30 -35y= 54y
-35y-54y=-30
89y=30
y=
3) Hallamos a X.
5x + 27()= 0
5x =-
x=
x=
Espero que sirva! Saludos!