Вправи: 1210

1210. Розв’яжіть систему рівнянь:

2x - 15 + y + 72 = 5│∙6, 2(2x – 1) + 3(y + 7) = 30,

3x - 15 + 2y + 13 = 6x + 8y15│∙15; 3(3x –1) + 5(2y + 1) =6x+ 8y;

4x – 2 + 3y + 21 = 30, 4x + 3y = 11, 4x + 3y = 11,

9x – 3 + 10y + 5 = 6x + 8y; 3x + 2y = –2; 2y = –2 – 3x;

4x + 3y = 11, 4x + 3 ∙ -2 - 3x2 = 11│∙2, 8x – 3(2 + 3x) = 22,

y = -2 - 3x2; y = -2 - 3x2; y = -2 - 3x2;

8x – 6 – 9x = 22, x = –28,

y = -2 - 3x2; y = 41.

Відповідь:(–28; 41).