Question

Решите систему уравнений
2(3х+2у)+9=4 х+21
2х+10=3-(6х+5у)

Answer 1

2(3x + 2y) + 9 = 4x +21

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

6x + 4y + 9 = 4x + 21

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

4y = -2x + 12

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

y = -0,5x + 3

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

2x + 10 = 3 - 6x - 5(-0,5x + 3)

2x + 10 = 3 - 6x + 2,5x - 15

5,5x = -22

x = -4.

y = 2 + 3

y = 5

Ответ: (-4;5).