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2014-02-12T20:52:56+02:00
4x+5y=17
4x=17-5y
x=17-5y supra 4
5x+4y=14
5*17-5y supra4 +4y=14
85-25y supra 4+4y=14 aducem la acelasi numitor
85-25y+16y=56
85-9y=56
-9y=56-85
-9y=-29
9y=29
y=29/9    x=2/9
10x+8y=
10*2/9+8*29/9
20/9+232/9
252/9=28