§ 50
\[\boxed{\mathbf{П.\ 50}}\]
\[\textbf{а)}\]

\[\textbf{б)}\ \]

\[K( - 2;7):\]
\[x = - 2;\ \ y = 7.\]
\[N( - 3;0):\]
\[x = - 3;\ \ y = 0.\]
\[M(0;7):\]
\[x = 0;\ \ y = 7.\]
\[\boxed{\mathbf{П.\ 50}}\]
\[\textbf{а)}\]

\[\textbf{б)}\ \]

\[K( - 2;7):\]
\[x = - 2;\ \ y = 7.\]
\[N( - 3;0):\]
\[x = - 3;\ \ y = 0.\]
\[M(0;7):\]
\[x = 0;\ \ y = 7.\]