Question

2x + 5y =16
3x - y = 15
Линейное уравнение

Answer 1

$\left \{ {{2x + 5y =16} \atop {3x - y = 15} \right. =\ \textgreater \ \left \{ {{2x + 5y =16} \atop {3x -15 = y} \right. =\ \textgreater \ \left \{ {{2x + 5(3x -15) =16} \atop {3x -15 = y} \right =\ \textgreater \ \left \{ {{2x + 15x -45 =16} \atop {3x -15 = y} \right =\ \textgreater \ \left \{ {{17x =61} \atop {3x -15 = y} \right =\ \textgreater \ \left \{ {{x=\frac{61}{17}} \atop {3x -15 = y} \right =\ \textgreater \ \left \{ {{x=\frac{61}{17}} \atop {3 \frac{61}{17} -15 = y} \right =\ \textgreater \ \left \{ {{x=\frac{61}{17}} \atop {3 \frac{61}{17} -15 = y} \right$