September 2018 1 42 Report
Identifica y subraya los errores cometidos en la resolucion del sistema

x+y=7->x=7-y se despeja la variable x
4x-y =3 -> x= __+ y/4 se despeja x
7-y=3+y/4 sustituyendo y=5
28 -4y = 12 +__y x= 7-y
-4y-4y =12 - 28 x= 7-5
-8y=__ x=2
y=__
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