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

User Russoue
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7 votes
-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
User Emeric
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