посчитайте с алгеброй даю 30 поинтов

1.
{ 6x - 5y = -38
{ 2x + 7y = 22 | × (-3)

{ 6x - 5y = -38
{ -6x - 21y = -66

6x - 6x - 5y - 21y = -38 - 66
-26y = -104
y = 4

6x - 5×4 = -38
6x - 20 = -38
6x = -18
x = -3

(x , y) = (-3 , 4)


2.
{ 4y - x = 11
{ 5x - 2y = 17 | ×2

{ 4y - x = 11
{ 10x - 4y = 34

4y - 4y + 10x - x = 11 + 34
9x = 45
x = 5

4y - 5 = 11
4y = 16
y = 4

(x , y) = (5 , 4)