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[tex]\left \{ {{x+y=12} \atop {x-y=2}} \right. \left \{ {x+y=19{} \atop {-x+y=1}} \right.[/tex]
[tex]\left \{ {{x+y=12} \atop {x-y=2}} \right. \left \{ {x+y=19{} \atop {-x+y=1}} \right.[/tex]
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х=2+у
2+у+у=12
у=5
х= 2+5
х= 7
х+у=19
у=1+х
х+1+х=19
х=9
у=1+9
у=10