mads34 mads34
  • 03-04-2017
  • Mathematics
contestada

2x+5y=60
2x-5y=-20


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Goalinetsky
Goalinetsky Goalinetsky
  • 03-04-2017
 (2x+5y=60)
- (2x-5y=-20)
-------------------
10y=80
y=8 


2x+5(8)=60
2x+40=60 
2x=20
x=10


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