03-04-2017
Mathematics

contestada

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

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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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