Question

Решите пожалуйста систему уравнения.

Answer 1

Общ. знаменатель 14 и 10
7 (2х + 3y) + 2 (3х - 2y) = 43
5 (3x + 2y) - 2 (5x - y) = 3

14x + 21y + 6x - 4y = 43
15x + 10y - 10x + 2y = 3

20x + 17y = 43
5x + 12y = 3 | *4

20x + 17y = 43
20x + 48y = 12

20x = 43 - 17y
20x = 12 - 48y

43 - 17y = 12 - 48y
43 - 12 = -48y + 17y
31 = -31y
y = -1

5x - 12 = 3
5x = 15
x = 3