Найдём точку пересечения прямых:
[tex]\displaystyle\bf\\\left \{ {{2x + y - 1 = 0} \atop {y = - 3x - 7 }} \right. \\ \\2x - 3x - 7 - 1 = 0 \\ - x - 8 = 0 \\ x = - 8 \\ \\ y = - 3 \times ( - 8) - 7 \\ y = 24 - 7 \\ y = 17 [/tex]
( - 8 ; 17 )
Ответ: у = 17
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Найдём точку пересечения прямых:
[tex]\displaystyle\bf\\\left \{ {{2x + y - 1 = 0} \atop {y = - 3x - 7 }} \right. \\ \\2x - 3x - 7 - 1 = 0 \\ - x - 8 = 0 \\ x = - 8 \\ \\ y = - 3 \times ( - 8) - 7 \\ y = 24 - 7 \\ y = 17 [/tex]
( - 8 ; 17 )
Ответ: у = 17