September 2018 1 69 Report
Resuelve los siguientes sistemas de ecuaciones mediante el metodo de suma o resta
1) x+2y=15
X+. Y=9

2) 2x+y=18
X+y=11

3) b-3c=-2
b-4c=-4

4) -5a+4b=0
-5a+6b=1

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