August 2018 1 26 Report
Que error esta cometido en cada sistema de ecuaciones?
a.-x-y=-1
x+2y=0
-x-y=-1 x+2y=0
x=-1+y x+2x-1/3=0
1+y+2y=0 x-2/3=0
3y=-1 x=2/3
y=-1/3

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

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