Решите систему,уравнений(на фото). Created by BABYSTORM. algebra-ru

Решите систему,уравнений(на фото)...

Verified answer

-13x + 12y = 35
-7,5y - 6 1/2x = -12

-13x + 12y = 35
-7,5y - 6,5x = -12 |·(-2)

-13x + 12y = 35
13x + 15y =24
Сложим и получим:
12y + 15y = 35 + 24

27y = 59

y = 59/27
-13x + 12y = 35

y = 59/27
-13x + 236/9 = 35

y = 59/27
-13x = 35 - 236/9

y = 59/27
-13x = 315/9 - 236/9

y = 59/27
-13x = -79/9

y = 59/27
x = -79/117

Ответ: (-79/117; 59/27).

1 votes Thanks 1

sedinalana

Verified answer

{-13x+12y=35
{-7,5y-6,5x=-12⇒15y+13x=24
прибавим
27y=59
y=59/27
13x+15*59/27=24
13x=24-885/27
13x=-237/27
x=-237/27:13
x=-237/351
x=-79/117

1 votes Thanks 0

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