December 2018 1 8 Report
Por favor:
1)
x+5y=8
x+11y=14
2)
x+y=13
2x-y=12
3)
x+y=13
x-y=5
4)
x+y= -10
x-y= -2
5)
x+y=5
x-y=7
6)
x= -5y-8
x+11y=4
7)
x=7 -2y
2x+y=12
8)
x=13-y
x-5=5
9)
x=y-2
x+y=10
10)
x=y+7
x+y=5


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