Question

4х-у=17

7х+3у=6    найти: х

                                -

                               у

(это система)

Answer 1

 

$4x-y=17 | * -3\ 7x+3y=6\ -12x+3y = -51\ 7x+3y=6\ 19x = 57\ x = 3\ y = 4x -17\ y = 12-17 = -5$