October 2018 1 71 Report
Encuentra el error cometido en la solución de cada sistema de ecuaciones

B. x-9=2y
Y-2x=-1
X-9=2y
X=2y+9.
Y-2x=-1
Y-2 (2y+9)=-1
Y-4y-18=-1
-3y=-1+18
Y=17/3

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