\(
\def\period#1{ \overset{ \mmlToken{mo}{⏜}}{#1 } }
\def\periodd#1{ \overset{ \mmlToken{mo}{⏜}}{#1 \hspace{0.1cm}} }
\def\perioddd#1{ \overset{ \mmlToken{mo}{⏜}}{#1 \hspace{0.3cm}} }
\)
Calculando...
1.\(\ \ \ \)\( \left\{ \begin{array}{l} 8 x- y = -41, \\ -6 x- y = 29. \end{array} \right. \)
\( x=-5 \), \( y=1 \).
2.\(\ \ \ \)\( \left\{ \begin{array}{l} 6 x-6 y = 2, \\ x+6 y = -6. \end{array} \right. \)
\( x= \)\( -4 / 7 \), \( y= \)\( -19 / 21 \).
3.\(\ \ \ \)\( \left\{ \begin{array}{l} x +1 = - x -1 -( y +1) , \\ 0 = -( x -1) . \\ \end{array} \right. \)
\( x=1, \) \( y=-5. \)
