Предмет: Алгебра, автор: julija1980a

5. Розв'язати систему рівнянь способом додавання: a) [8a+3b=4, 2a-4b=-18; б)3x-5y=14, 2x-7y=2.​

Приложения:

Ответы

Автор ответа: darikrod
1

Ответ: А) a = -1, b = 4

            B) x = 8, y = 2

Объяснение:

А)

{8a + 3b = 4

{2a - 4b = -18 |*4

{8a + 3b = 4

{8a - 16b = -72

{8a + 3b = 4

{19b = 76

{a = -1

{b = 4

Б)

{3x - 5y = 14 |*2

{2x - 7y = 2  |*3

{3x - 5y = 14

{11y = 22

{x = 8

{y = 2

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