\[\boxed{\text{74.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[- 31x = - 31\]
\[x = 1.\]
\[3y = 10 + 2x = 12\]
\[y = 4.\]
\[Ответ:(1;4).\]
\[- 46y = - 46\]
\[y = 1.\]
\[x = 12,5 - 11y = 12,5 - 11 =\]
\[= 1,5.\]
\[Ответ:(1,5;1).\]