https://wisdomessays.com/wp-content/uploads/2020/07/logo-300x60.png00adminhttps://wisdomessays.com/wp-content/uploads/2020/07/logo-300x60.pngadmin2020-07-27 03:41:112020-07-27 03:41:11Solve the following problems algebraically using elimination by addition and subtraction x+y=1 x+3y=9