2х+3у=2 2х+3*(-2)=2 2х=8 х=4
8у=-16 у=-2 у=-2 у=-2
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х+7у=19 13-5у+7у=19 2у=6 у=3 у=3
х=13-5у х=13-5у х=13-5у х=13-5*3 х=-2
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10х-4у=30 у=-5 у=-5
10х-5у=35 10х-5*(-5)=35 х=1
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6х+10у=32 у=5 у=5
6х+9у=27 6х+9*5=27 х=-3
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6х-10у=46 -19у=19 у=-1 у=-1
6х+9у=27 6х+9у=27 6х+9*(-1)=27 х=6