Question

va rog mult ajutatima​

Answer 1

Explicație pas cu pas:

b) 6y-3x - 6x - 2y = - 40

4x +6y +4x+24y = 2

-9x+4y = - 40

8x+30y = 2

-72x + 32y = - 320

72x + 270y = 18

238y = - 212

y= - 212/238 = - 106/119

-9x = - 40 - 4 × (-106/119) = - 40 + 424/119

-9x =( - 4760 + 424)/119 = - 4336/119

x = - 4336/119 : (-9) = 4336/119 × 1/9 = 4336/1071

d) 6x - 3y +3 +6 + 6x - 15y - 3 = 3x - 3

10 - 5y - 5x +3x - 3 = 3x - 6 - 2

12x - 18y + 6 = 3x - 3

-2x - 5y + 7 = 3x - 8

12x - 3x - 18y = - 3 - 6

-2x - 3x - 18y = - 8 - 7

9x - 18y = - 9

-5x - 18y = - 15

9x - 18y = - 9

5x + 18y = 15

14x = 6

x= 6/14 = 3/7

-5×(3/7) - 18y = - 15

- 15/7 - 18y = - 15

18y = - 15/7 + 15 = - 15/7 + 105/7 = 90/7

y = 90/7 : 18 = 90/7 × 1/18 = 5/7