Question

Sistemul, vă rog. Mulțumesc !

$\it 2(3x + 2y) +2(-x - 4y)=-12\\ \\ 12(5x + y) - 4y =-14$

Answer 1

Răspuns:

2(3x + 2y) + 2(- x - 4y) = - 12

12(5x + y) - 4y = - 14

6x + 4y - 2x - 8y = - 12

60x + 12y - 4y = - 14

4x - 4y = - 12  | : 4

60x + 8y = - 14  | : 2

x - y = - 3

30x + 4y = - 7

x = y - 3

inlocuim x

30(y - 3) + 4y = - 7

30y - 90 + 4y = - 7

34y = 90 - 7

34y = 83

y = 83/34

inlocuim y

x = 83/34 - ³⁴⁾3

x = (83 - 102)/34

x = - 19/34

$solutii~x=-\frac{19}{34}~~y=\frac{83}{34}$