Question

СРОЧНО ДАМ 100 БАЛЛОВ

Answer 1

1) 1+2x -2y=3x-4y
10-4x-4y=3x -3y

x-2y=1
7x+у=10

х=2y-1
7(2y-1)+y=10

14y-7+y=10
15у+7=10
15у=3
у=0,2
x=1,4
(1,4;0,2)

Answer 2

$\left \{ {{1+2x-2y=3x-4y} \atop {10-4x-4y=3x-3y}} \right.\\\\ \left \{ {{x-2y=1} \atop {7x+y=10}} \right. \\\\ +\left \{ {{x-2y=1} \atop {14x+2y=20}} \right.$
_________
15x = 21
x = 1,4
y = 10 - 7x = 10 - 7 * 1,4 = 10 - 9,8 = 0,2
Ответ : (1,4 ; 0,2)

$\left \{ {{ \frac{x}{2}*6- \frac{y}{6} *6=1*6 } \atop { \frac{x}{4} *12+ \frac{y}{3} *12=3*12}} \right.\\\\ -\left \{ {{3x-y=6} \atop {3x+4y=36}} \right.$
_______________
- 5y = - 30
y = 6
3x - 6 = 6
3x = 12
x = 4
Ответ : (4 ; 6)