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ser-zykov [4K]
3 years ago
7

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

Mathematics
1 answer:
larisa86 [58]3 years ago
4 0
-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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