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28-10-2015
Mathematics

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-5x+4y=20
10x-8y=-40

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28-10-2015

-5x+4y=20 (2)
10x-8y=-40
=============
-10x+8y=40
10x-8y=-40
-------------------------- ( - )
-20x == => x=0
-5*0+4y=20 => 0+4y=20 => 4y=20 => y=5

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