Ответ:
х= -2 5/42; у=17/42
Объяснение:
6х-18у= -20
у-5х=11
3х-9у= -10
у-5х=11
у=11+5х
3х-9(11+5х)= -10
3х-99-45х= -10
-99-42х= -10
99+42х=10
42х=10-99
х= -89/42= -2 5/42
у=11+5×(-89/42)=11-445/42=10 42/42 -10 25/42=17/42
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