Question

решите систему уравнений
8x – 3y = 7
5x + y = 9

2x + y = 4
5x + y = 10​

Answer 1

Ответ:

Пошаговое объяснение:

a) 8x – 3y = 7

5x + y = 9

8x – 3y = 7

y = 9 - 5x

8x - 3(9 - 5x) = 7

y = 9 - 5x

23x = 34

y = 9 - 5x

x = 1 11/23

y = 9 - 5 * (1 11/23)

x = 1 11/23

y = 1 14/23

b) 2x + y = 4

5x + y = 10​

2x + y = 4

5x + y - 2x - y = 10​ - 4

2x + y = 4

3x = 6

y = 4 - 2x

x = 2

x = 2

y = 4 - 2*2

x = 2

y = 0