Помогите пожалуйста . Created by ZnanijapluseStupid. algebra-ru

Объяснение:Суммируем эти уравнения:Ответ: (-0,2;-3,4).

Помогите пожалуйста ...

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Объяснение:

$\left \{ {{2x-y=3} \atop {3x+y=-4}} \right. .$

Суммируем эти уравнения:

$5x=-1\ |:5\\x=-0,2.\\3*(-0,2)+y=-4\\-0,6+y=-4\\y=-3,4.$

Ответ: (-0,2;-3,4).

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sangers1959

Verified answer

Ответ:

$x = -\frac{1}{5}$

Объяснение:

$\left \{ {{2x-y=3} \atop {3x+y=-4}} \right.\\\left \{ {{-y=3-2x} \atop {y = -4-3x}} \right.\\\left \{ {{y = - (3-2x)} \atop {y = -4-3x}} \right.\\\left \{ {{y = -3+2x} \atop {y = -4-3x}} \right.\\\\-3+2x = -4-3x\\2x+3x=-4+3\\5x=-1\\x=-\frac{1}{5}$

Проверка:

$\left \{ {{2*-\frac{1}{5}-y=3} \atop {3*-\frac{1}{5}+y=-4}} \right.\\\left \{ {{-\frac{2}{5}-y=3} \atop {-\frac{3}{5}+y=-4}} \right.\\\left \{ {{-y = 3 + \frac{2}{5} } \atop {y = -4 + \frac{3}{5}}} \right.\\-y = \frac{15 + 2}{5} = \frac{17}{5} => y = -\frac{17}{5} \\y = \frac{-20 +3}{5} = -\frac{17}{5}$

Итого, ответ $x = -\frac{1}{5}$

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