Question

СРОЧНО НА ВСЕ ТРИ ВОПРОСА ​

Answer 1

1.

x-2y=14

2x +5y=1

x=14+2y

2x+5y=1

2(14+2y)+5y =1

y= -3

x=14+2*(-3)

x=8

(8, -3)

2.

$2x-3y=2\\5x+2y=24\\\\2x-3y=2\\x=\frac{24}{5} -\frac{2}{5} y\\\\2(\frac{24}{5} -\frac{2}{5} y)-3y=2\\y=2\\\\x=\frac{24}{5} -\frac{2}{5} *2\\x=4\\\\(4,2)$

3.

5x+5y= -20

5y+2x=25

5x+5y=-20

5y = 25-2x

5x+25-2x= -20

x= -15

5y=25-2*(-15)

y=11

(-15, 11)