Решите систему уравнений

1) x+10y=25

26 (x-y) + 5y=10

2) 16x-5y=10

2x-3y=15

1) x+10y=25

26 (x-y) + 5y=10

x=25-10y

26 (25-10y-y) + 5y=10

x=25-10y

26 (25-11y) + 5y=10

x=25-10y

650-286y+5y=10

x=25-10y

281y=640

x=25-10y

y=640/281

x=25-640/281*10

y=640/281

x=625/281

y=640/281

2) 16x-5y=10

2x-3y=15 * 8

16x-5y=10

16x-24y=120

-24y - (-5y) = 120-10

2x=15+3y

-19y=110

x=7.5+1.5y

y=-110/19

x=7.5+1.5 * (-110/19)

y=-110/19

x=22.5/19

y=-110/19

x=45/38