Huỳnh Anh Phương
29/08/2018 at 02:30-
Lê Anh Duy 01/09/2018 at 16:043x + y = 10y + x
=> 2x = 9y
=> y = 2; x = 9 => x + y = 11
Huỳnh Anh Phương selected this answer.
3x + y = 10y + x
=> 2x = 9y
=> y = 2; x = 9 => x + y = 11
Huỳnh Anh Phương selected this answer.