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2014-09-06T18:41:12+03:00
3x+5y=23
5x+3y=17
________(+)
8x+8y=40<=>8(x+y)=40<=>x+y=5(1)
 
3x+5y=23
5x+3y=17
________(-)
-2x+2y=6<=>2(-x+y)=6<=>-x+y=3(2)
 
(1)+(2)
x+y=5
-x+y=3
_____(+)
2y=8<=>y=4=>x=1


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