Question

Срочно помогите!!!! Даю много балов!!! Надо заделать 1,2,4

Answer 1

1)

2х + 3у = 6

3х - у = 9

3у = - 2х + 6

у = 3х - 9

у = - 2/3 х + 2

у = 3х - 9

Ответ: ( 3 ; 0 )

2)

$4x + 5y = 1 \\8 x - 2y = 38 \\ \\4x + 5(4x - 19) = 1 \\ y = 4x - 19 \\ \\ 4x + 20x - 95 = 1 \\ 24x = 1 + 95 \\ 24x = 96 \\ x = 96 \div 24 \\ x = 4 \\ \\ y = 4 \times 4 - 19 = 16 - 19 = - 3$

Ответ: ( 4 ; - 3 )

4)

$4x - y = 29 \\ 7x + 2y = 2 \\ \\ y = 4x - 29 \\ 7x + 2(4x - 29) = 2 \\ \\ 7x + 8x - 58 = 2 \\ 15x = 2 + 58 \\ 15x = 60 \\ x = 60 \div 15 \\ x = 4 \\ \\ y = 4 \times 4 - 9 = 16 - 29 = - 13$

Ответ: ( 4 ; - 13 )