Question

СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

Пояснення:

$\displaystyle\\\left \{ {{3x-5y=14\ |*4} \atop {4x-14y=4\ |*(-3)}} \right. \ \ \ \ \ +\left \{ {{12x-20y=56} \atop {-12x+42y=-12}} \right. \ \ \ \ \ \ \Rightarrow\\\\22y=44\ |:22\\\\y=2.\\\\3x-5*2=14\\\\3x-10=14\\\\3x=24\ |:3\\\\x=8.$

Відповідь: (8;2).

Answer 2

$\displaystyle\bf\\\left \{ {{3x - 5y = 14 \: \: | \times 14} \atop {4x - 14y = 4 \: \: | \times( - 5) }} \right. \\ \displaystyle\bf\\ + \left \{ {{42x - 70y = 196} \atop { - 20x + 70y = - 20 }} \right. \\ \\ 42x - 20x = 196 - 20 \\ 22x = 176 \\ x = 176 \div 22 \\ x = 8 \\ \\ 3 \times 8 - 5y = 14 \\ 24 - 5y = 14 \\ 5y = 24 - 14 \\ 5y = 10 \\ y = 10 \div 5 \\ y = 2$

Ответ: ( 8 ; 2 )