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-2x+2y= -18
despejamos x en ambas ecuaciones
6x+9y=39............6x=39-9y.................x=39-9y
6
-2x+2y= -18............ -2x= -18-2y..........x= -2y-18
-2
ahora igualamos:
39-9y = -2y-18
6 -2
-2(39-9y)=6(-2y-18)
-78+18y= -12y-108
18y+12y=78-108
30y= -30
y= -30/30
y= -1
si y= -1
x= -2y-18 ............... -2(-1)-18...............2-18...... -16=8
-2 -2 -2 -2
solucion:
x=8 y= -1