resolver por metodo de igualacion
2x-y=1
-x+2y=7
x=2.7-(-1).7 14+7 21
2.(-1)-(-1).2 = -2+2 = 0 = 21
Y=2.1-(-1).7 2+7 9 3
21 = 21 = 21 = 7
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x=2.7-(-1).7 14+7 21
2.(-1)-(-1).2 = -2+2 = 0 = 21
Y=2.1-(-1).7 2+7 9 3
21 = 21 = 21 = 7