10х+6у=7 |*(-1)
10х-2у=0
-10х-6у= -7
-10х+10х-6у-2у= -7+0
-8у= -7
у=7/8
10х=2у
х=2у/10
х=1/5у
х=1/5*7/8
х=7/40
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10х+6у=7 |*(-1)
10х-2у=0
-10х-6у= -7
10х-2у=0
-10х+10х-6у-2у= -7+0
-8у= -7
у=7/8
10х=2у
х=2у/10
х=1/5у
х=1/5*7/8
х=7/40