Question

ДАЮ 30 баллов СИСТЕМА УРАВНЕНИЙ СПОСОБОМ СЛОЖЕНИЯ ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

Ответ:

$\left \{ {{y=\frac{2}{3} } \atop {x=1}} \right.$     $\left \{ {{x=6} \atop {y = 21}} \right.$    $\left \{ {{x= 2} \atop {y=1}} \right.$     $\left \{ {{x=9,5} \atop {y=4}} \right.$

Объяснение:

$\left \{ {{7x - 3y = 5} \atop {4x + 3y = 6}} \right.$

$\left \{ {{7x - 3y = 5} \atop {4x + 7x - 3y + 3y = 5 + 6}} \right.$

$\left \{ {{7x - 3y = 5} \atop {11x = 11}} \right.$

$\left \{ {{7x - 3y = 5} \atop {x=1}} \right.$

$\left \{ {{7 * 1 - 3y = 5} \atop {x=1}} \right.$

$\left \{ {{ - 3y = 5-7} \atop {x=1}} \right.$

$\left \{ {{- 3y = -2} \atop {x=1}} \right.$

$\left \{ {{y=\frac{2}{3} } \atop {x=1}} \right.$

$\left \{ {{5x - 2y = -12} \atop {6x - 2y = -6}} \right.$

$\left \{ {{-5x + 2y = 12} \atop {6x - 2y = -6}} \right.$

$\left \{ {{-5x + 6x + 2y - 2y = 12 - 6} \atop {6x - 2y = -6}} \right.$

$\left \{ {{x = 6} \atop {6x - 2y = -6}} \right.$

$\left \{ {{x = 6} \atop {6 * 6 - 2y = -6}} \right.$

$\left \{ {{x = 6} \atop {36 - 2y = -6}} \right.$

$\left \{ {{x = 6} \atop {-2y = -42}} \right.$

$\left \{ {{x=6} \atop {y = 21}} \right.$

$\left \{ {{x + 7y - 9 = 0} \atop {x - 5y = -3}} \right.$

$\left \{ {{x + 7y = 9} \atop {-x+5y=3}} \right.$

$\left \{ {{x + 7y = 9} \atop {x - x + 7y +5y = 9 + 3}} \right.$

$\left \{ {{x + 7y = 9} \atop {12y = 12}} \right.$

$\left \{ {{x + 7y = 9} \atop {y = 1}} \right.$

$\left \{ {{x + 7*1 = 9} \atop {y=1}} \right.$

$\left \{ {{x = 9 - 7} \atop {y=1}} \right.$

$\left \{ {{x= 2} \atop {y=1}} \right.$

$\left \{ {{4(x - 1) = 6y + 10} \atop {2(x-3)= 5y - 7}} \right.$

$\left \{ {{4x - 4 - 6y = 10} \atop {2x - 6 - 5y = -7}} \right.$

$\left \{ {{4x - 6y = 10 + 4} \atop {2x - 5y = - 7 + 6}} \right.$

$\left \{ {{4x - 6y = 14} \atop {2x - 5y = -1}} \right.$

$\left \{ {{4x - 6y = 14} \atop {-4x + 10y = 2}} \right.$

$\left \{ {{4x - 6y = 14} \atop {4x - 4x - 6y + 10y = 14 + 2}} \right.$

$\left \{ {{4x - 6y = 14} \atop {4y = 16}} \right.$

$\left \{ {{4x - 6*4 = 14} \atop {y = 4}} \right.$

$\left \{ {{4x - 24 = 14} \atop {y=4}} \right.$

$\left \{ {{4x = 14+24} \atop {y=4}} \right.$

$\left \{ {{4x = 38} \atop {y= 4}} \right.$

$\left \{ {{x=9,5} \atop {y=4}} \right.$

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