Question

Решите систему уравнения.

2-4y=3(x-2)
2(x+y)=5y+2,5

Answer 1

2-4y=3(x-2)
2(x+y)=5y+2,5
2 - 4y = 3x - 6
2x + 2y = 5y + 2.5
3x + 4y = 8|*3
2x - 3y = 2.5|*4
9x + 12y = 24
+
8x - 12y = 10
___________
17x = 34
x = 34/17
x = 2
y = (8 - 3x)/4 = (8 - 6)/4 = 2/4 = 0.5
Ответ (2; 0.5)

Answer 2

Спасибо